Impact Of External Trade On Nigeria’s Economic Growth (1980-2013)

Project and Seminar Material for Economics

Impact Of External Trade On Nigeria’s Economic Growth (1980-2013)


This study empirically examined the impact of external trade on economic growth of Nigeria between the period 1980-2013. In carrying out this project, linear multiple regression analysis techniques was used in assessing various components of foreign trade. Data used in this study were extracted from CBN statistical bulletin, 2011 edition; secondary data for the period 1980 to 2013 was used for the study. The regression analysis was carried out using E-views statistical tool. From the analysis the results shows that export, exchange rate, foreign direct investment are positively related while import is negatively related to output (proxy by GDP) of Nigeria and the Adjusted R2 is 0.96 for the period of 1980-2013. This study has examined the performance of foreign trade in relations to economic growth in Nigeria. It is therefore concluded that, conscious efforts should be made by government to fine-tune the various macroeconomic variables in order to provide an enabling environment to stimulate foreign trade by engaging in more of export trade and in effect curtail on import trade which has a negative effect or strain the economy. Also government should encourage export diversification.

Chapter One


1.1 Background of the Study

Starting from Adam Smith’s discussion on specialization and the extant of the market by external trade, to the debates about import substitution versus exported growth (growth based on exporting more goods and services), to recent work on increasing returns and endogenous growth models, there are increasing debates among economists about the external trade and economic growth ( Dushko and Darko2013).

Economists have long been interested in factors which cause different countries to grow at different rates and achieve different levels of wealth. One of such factors is trade. Nigeria is basically an open economy with international transactions constituting a significant proportion of her aggregate output (Mike and Okojie 2013). The Nigerian government like many other developing countries considers trade as the main engine of its development strategies, because of the implicit belief thattrade can create jobs, expand markets, raise incomes, facilitate competition and disseminate knowledge (Ogbajiand Ebebe 2013).Nevertheless, while trade between countries may generate growth globally, there are no guarantees that its aggregate benefits are distributed equitably among trading partners. There are winners and losers in any trading relationship. However trading partners all may gain differing degrees. Many factors determine the extent to which a country may benefit from a trading relationship. These include the terms of trade a country faces vis-à-vis its trading partners, the international exchange rate among the traded goods and the market characteristics of the country’s exportable goods (Eravwoke and Oyovwi 2013).This has been the experience of Nigeria since the 1960s even though the composition of trade has changed over the years. Foreign trade has been an area of interest to decision makers, policy makers as well as economists. It enables nations to sell their locally produced goods to other countries of the world (Adewuyi, 2000) as quoted by (JohnAiyelabola 2013).The word trade has been defined in the Oxford Advanced Learner dictionary as “the activity in which people are buying and selling or exchanging the goods and services between countries”. External trade is the exchange of capital, goods, and services across international borders. Zahoor,Imran,Anam,Saif-ullaha,Ashraf (2013) said it is a system where the goods and services are advertised, sell and switched between two or more than two countries through import and export.

The role of foreign trade in economic development is considerable. The classical and neo-classical economists attached so much importance to foreign trade in a nation’s development that they regarded it as an engine of growth. Over the past several decades, the economies of the world have become greatly connected through external trade and globalization. Foreign trade has been identified as the oldest and most important part of a country’s external economic relationships. It plays a vital and central role in the development of a modern global economy. Its impact on the growth and development of countries has increased considerably over the years and has significantly contributed to the advancement of the world economy. The impact of foreign trade on a country’s economy is not only limited to the quantitative gains, but also structural change in the economy and facilitating of international capital flow. Trade enhances the efficient production of goods and services through allocation of resources to countries that have comparative advantage in their production. Foreign trade has been identified as an instrument and driver of economic growth (Frankel and Romer, 1999).

According to Oluwasola and Olumide(2013), the basis for foreign trade rests on the fact that nations of the world do differ in their resource endowment, preferences, technology, scale of production and capacity for growth and development. Countries engage in trade with one another because of these major differences and foreign trade has opened up avenues for nations to exchange and consume goods and services which they do not produce. They further said that the differences in natural endowment present a case where countries can only consume what they have the capacity to produce, but trade enables them to consume what other countries produce. Therefore countries engage in trade in order to enjoy variety of goods and services and improve their people’s standard of living.

The current period in the world economy is regarded as period of globalization and trade liberalization. In this period, one of the crucial issues in development and international economics is to know whether foreign trade indeed promotes growth. With globalization, two major trends are noticeable: first is the emergence of multinational firms with strong presence in different, strategically located markets; and secondly, convergence of consumer tastes for the most competitive products, irrespective of where they are made. In this context of the world as a “global village”, regional integration constitutes an effective means of not only improving the level of participation of countries in the sub-region in world trade, but also their integration into the borderless and interlinked global economy.

Foreign trade allows a country or nation to expand her markets for both goods and services that otherwise may not have been available to her citizens. Foreign trade means per capita income has been based on the domestic production, consumption activities and in conjunction with foreign transaction of goods and services.
It has been established in several literatures that export trade is an engine of growth. It increases foreign exchange earnings, improves balance of payment position, creates employment and development of export oriented industries in the manufacturing sector and improves government revenue through taxes, levies and tariffs. These benefits will eventually transform into better living condition for the nationals of the exporting economy since foreign exchange derived would contribute to meeting their needs for some essential goods and services. However, before these benefits can be fully realized, the structure and direction of these exports must be carefully tailored such that the economy will not depend on only one sector for the supply of needed foreign exchange (John and Aiyelabola 2013).

Foreign trade has been regarded as an engine of growth (Adewuyi, 2002). Foreign trade as it has been regarded as an engine of growth must lead to steady improvement in human status by expanding the range of people’s standard and preference. Since no country has grown without trade, foreign trade plays a vital role in restructuring economic and social attributes of countries around the world, particularly the less developed countries (Usman 2011).
Though external trade can be made up of Foreign Direct Investment and Foreign Portfolio Investment, Foreign Direct Investment is often preferred as a means of boosting the economy. This is because FDI disseminates advanced technological and managerial practices through the host country and thereby exhibits greater positive externalities compared with Foreign Portfolio investment which may not involve positive transfers, just being a change in ownership. In addition, available data suggest that FDI flows tend to be more stable compared to Foreign Portfolio Investment (Lipsey, 1999). This is because of the liquidity of Foreign Portfolio Investment and the short time horizon associated with such investments. Also, FDI inflows can be less affected by change in national exchange rates as compared to Foreign Portfolio Investment. However, a balanced combination of the two, taking into consideration the unique characteristics of the recipient economy will bring about the required effects on the economy (Tokunbo and Lloyd 2010).

Since the 1980s, flows of investment have increased dramatically the world over. Despite the increased flow of investment to developing countries in particular, Sub-Sahara African (SSA) countries are still characterized by low per-capita income, high unemployment rates and low falling growth rates of GDP, problems which foreign private investment are theoretically supposed to solve. Nigeria, being one of the top three countries that consistently received FDI in the last decade is not exempted from this category (Ayanwale, 2007).

Growth performance of the Nigerian economy has been determined by both domestic production and consumption activities as well as foreign transactions in goods and services. Before her political independence, the Nigerian economy was well known for its exports-driven growth particularly before the discovery of oil when the country used to record a huge success in the export of non-oil products especially agricultural produce. It is obvious that for long the non-oil exports in Nigeria had been taken over by the oil sector, even though the performance of the economy in the last decade was quite very surprising. This is partly because of the country’s stronger ties with developed and emerging economies especially after the transition to civilian rule in 1999 and partly the recent global economic and of course Niger Delta crises, which rendered the oil sector at disadvantage when it comes to the sector’s contribution to the growth of the economy. This underscores the need to not only diversify the economy but also target the country’s rate of growth through agricultural and non-oil exports. This is also particularly important when one considers the comparative advantage the country has had in agricultural and non-oil exports as a labour abundant economy with huge minerals and arable but uncultivated lands (Sikiru, Shehu Dan, DOGON-DAJI, Jimoh 2013).

Before the discovery of oil in 1960’s, the Nigerian government was able to execute investment project through domestic savings, earning from agricultural product exports and foreign aids. Since the advent of oil as a major source of foreign exchange earning Nigeria in 1974 the picture has been almost that of general stagnation in agricultural exports. This led to the loss of Nigeria’s position as an important producer and exporter of palm oil produce, groundnut, cocoa and rubber (CBN annual report, 2006). Between the year 1960 and 1980, agricultural and agro-allied exports constituted an average of sixty percent of total export in Nigeria, which is now accounted for, by petroleum oil export.

Furthermore, by 1977, export stood at N7, 881.7 million. Between 1960 and 1977, value of export grew by 19 percent. It should be noted that before 1972, most of the export were agricultural commodities like cocoa, palm produces, cotton and groundnut. Thereafter, minerals, especially crude, petroleum, became significant export commodities. Imports also increased in values during the period. By 1960, import were valued at N432 million. They increased to N758.99 million and N8.132 million in 1970 and 1978 respectively, rising to N124, 162.7 million in 1992 and N681, 728.3 million in 1997.

However, from 1974, food import became noticeable in Nigeria foreign trade. The country had an unfavourable trade balance from 1960 to 1965, partly because of the aggressive drive to import all kinds of machinery to stimulate the industrialization strategy pursued immediately after independence. Thereafter, export of crude petroleum guaranteed a favourable trade balance. The oil sector dominates export while the non oil sector dominates import. Between 1960 – 1970 oil export grew by 44.6 percent and 31.6 percent respectively. Also, for this period, non-oil export showed marginal growth of 1.2 percent and 6.6 percent.

In addition, in 2005, Nigeria imported about US$26 billion of goods. In 2004, the leading sources in import were China (9.4 percent), The United States (8.4 percent), the United Kingdom (7.8 percent), the Netherlands (5.9 percent), France (5.4 percent), Germany (4.8 percent), and Italy (4 percent). Principal imports were manufactured goods, machinery and transport equipment, chemical and food and live animal. Also in 2005, Nigeria exported about US$52 billion of goods. In 2004, the leading destinations for export were the United State (47.4 percent), Brazil (10.7 percent), and Spain (7.1 percent). In 2004, oil accounted for 95 percent of merchandise export, and cocoa and rubber accounted for almost 60 percent of the remainder. Nigeria exports go to almost the same source where her imports come from (Usman 2011).

The Nigerian Government is putting so much effort into attracting foreign investors and yet the economy is still dwindling (Tokunbo and Lloyd 2010)

In response to these enormous problems, Structural Adjustment Program (SAP) was introduced in 1986 in the country. This was to liberalize and diversify the economy. With SAP in place, several export promotion strategies and policies especially on manufacturing export were formulated, which include various incentives on export, Research and Development (R&D) etc. Despite this effort to improve and diversify export the outcomes were not recommended. This was because the share of manufacturing export remains so low in the total export earning as compared to the oil sector in particular or primary goods in general. Evidence shows that the share of manufacturing export as percentage of total export remains less than 1 percent up to year 2000, as compared to average level of other sub-Saharan African countries of 6.2 percent of more than 70 percent of Eastern Asian countries. This is the nature and trend of Nigeria’s export over decades as well as how, from experience, the fluctuations in the volume of the export affect the level of economic growth.(John and Aiyelabola 2013).

Since the last twenty years, economic policy in Nigeria can be characterized by trade liberalization and regional integration which is defined by the radical reducing or removal of trade barriers. The World Trade Organization (WTO) the IMF and especially the World Bank (WB) have obtained considerable powers to sway policies in countries towards this path. As a part of the global Structural Adjustment Programme, it is assumed and argued that trade liberalization improves the welfare of consumers and trims down poverty. The assertion was two-fold and simple.

First, it is argued that liberalization offers wider room for choice from an array of quality goods and cheaper imports also find more lucrative markets in which their products can be sold. A second argument is that, the production of goods in which a country has comparative advantage expands, while the sectors with comparative disadvantage minimize. This is believed to lead to an overall rise in real GDP since there would be reallocation of the productive factors from less efficient sectors to more efficient sectors (John and Aiyelabola 2013). Therefore, research on how external trade contributed to Nigeria’s economy growth can serve as a distinguishing case study revealing a latecomer catches up with forerunners by increasing his participation on the global stage. Against this background, this study is focused on analyzing and making attempt to advance on other works in external trade and growth of the Nigerian economy from 1980-2013 with main focus on Nigerian non-oil sector

1.2 Statement of the Problem

The importance of external trade in the development process has been of interest to development economists and policy makers alike. Imports and exports are a key part of external trade and the import of capital goods in particular is vital to economic growth. This is so because imported capital goods directly affect investment, which in turn constitutes the motor of economic expansion. Economic reform is expected to affect imports as part of the strategy to restore external balance. However, unless policy makers know what the major components of imports are and how they are determined, such a policy decision can be harmful to investment and output if domestic production relies on imports. In Nigeria, some people are in favour of protectionist and highly regulated economy and have even criticized the previous Nigerian government, for signing the treaty of the World Trade Organization (WTO), claiming that, Nigeria was not adequately represented in the negotiations and should push for a fairer deal. As regards to this statement, some people, particularly economists pushed for the implementation of the Structural Adjustment Programme (SAP) in 1986 which brought about deregulation of formerly regulated areas of the economy, so that the country could reap the benefits of economic openness.

Promotion of economic growth is one of the objectives of foreign trade but in recent times, this has not been the case because the Nigerian economy still experience some element of economic instability such as high level of unemployment, price instability and adverse balances of payment to mention a few.

A recent study by the U.N. Secretariat provides ample proof, that the problem of the economic development of the low-income countries cannot be solved without these countries becoming not only producers, but also exporters of manufactured goods, on an important scale. At present 86 per cent of the exports of the developing countries consists of primary products, and only 14 percent of manufactured goods. If the primary exporting regions were to continue to depend mainly on the exports of primary products, their export receipts to the outside world could not be expected to increase by more than three per cent annually, even if their export prices remained constant. Their import requirements, on the other hand, would be bound to increase faster than their domestic product mainly because their import requirements for capital goods increase faster than their domestic fixed capital formation, and also because their own income elasticity of imports of consumer goods and raw materials are high (Nicholas 2000).
One of the motives why benefits of foreign trade cannot be translated into economic growth is the macroeconomic policy distortions resulting from the trade which turned the country into an import dependent economy. The import of the country grew from N0.7 billion in 1970 to over N562 billion in 1996 and later increase to N1, 266 billion in 2001, (CBN Annual Report, 2004). Also as one of the reason why the benefits of foreign trade cannot be translated into economic growth is that most of the goods and services exhibited are in respect to service rendering.

The importance of foreign trade in the Nigeria economy has grown rapidly in recent time, especially since 2002. Economic openness, measured as the ratio of export and imports to GDP has risen from just above 3 percent in 1991 to over 11 percent in 2008. The moderation in the growth rate of trade in 2008 partly reflects the unrest in Nigeria’s oil producing Niger Delta region, which resulted in significant disruption in oil production and shortfalls in oil export from Nigeria(Usman 2011).

Furthermore, foreign trade has not accrued into economic growth because some of the goods imported into the country were those that cause damages to local industries by rendering their product inferior and being neglected, this thereby reduces the growth rate of output of such industries and this later spread to the aggregate economy.

For this reason, it is worthy of note to analyze the external trade and growth of the Nigerian economy, laying emphasis on Nigerian non oil sector. The main thrust of this research is to take an objective view regarding the controversy of the role of external trade, in the progress of a country in terms of economic growth of Nigeria. It is evidenced that Nigeria is practicing a mono economy system i.e a heavy dependence on oil for its foreign exchange earnings. It has also been observed that Nigerian governments have seriously neglected the non-oil sector which has been our major source of foreign exchange earnings in the early 1960s. This study seeks to analyze critically, Nigeria’s involvement in external trade and the contributions of the non-oil sector so far from 1980-2013 and proffer solutions on how Nigerian governments can revitalize the sector so as to attract foreign direct investment (FDI), and achieve a favourable balance of payment which will invariably lead to economic growth.

1.3 Objective of the Study

The main objective of this study is to evaluate the performance of foreign trade and its contribution to economic growth in Nigeria.

Specifically the research work will focus on the following objectives:

  1. To ascertain the impact of export trade on the Nigerian economy
  2. To determine the impact of import trade on the Nigerian economy
  3. To assess the effect of exchange rate on economic growth in Nigeria.
  4. To find out the consequence of foreign direct investment on Nigerian economic growths.

1.4 Research Questions

The study shall be guided by the following research questions,

  1. To what extent does export impact on economic growth in Nigeria?
  2. To what extent does import impact on economic growth in Nigeria?
  3. How far does an exchange rate have impact on economic growth in Nigeria?
  4. What are the effects of foreign direct investment on economic growth in Nigeria?

1.5 The Research Hypotheses

H0: Export trade does not have a significant positive impact on the Nigeria’s economic growth

H0: There is no significant impact of import trade on the Nigerian economic growth

H0: Exchange rates do not have positive impact on the Nigerian economic growth

H0: Foreign direct investment does not have any impact on the Nigerian economic growth

1.6 Scope of the Study

This research work is going to cover Nigeria external trade involvement from the point of Import and Export activities within the period 1980-2013 (32 years).This period is believed to cover the major part of Nigerian participation in external trade; it is within the geographical zone of Nigeria. Thus, it is a country-specific research. This research exercise, like every other research work, is really a rigorous one that consumes much time and energy especially in the area of data sourcing, data computation and modeling. This work is relatively limited base on time constraints, data availability, precision of data and data range, and methodology adopted which could further be verified by future research. Nevertheless, the researcher has properly organized the research so as to present dependable results which can aid effective policy making and implementation at least for the time being.

1.7 Significance of the Study

The findings of this research work transcend beyond mere academic brainstorming, but will be of immense benefit to, policy makers, intellectual researchers, government students and the general public.

Policy Makers:

This study will be essential to policy maker to know more about the performance of foreign trade and economic growth.

Academic Researchers:

It will assist in providing the frame work of where work has been done by earlier researchers. It will also provide a framework on which further research in foreign trade could be carried out.


This research work will further serve as a guide and provide insight for future research on this topic and related field for students who are willing to improve it.


It will also help the government to see the effectiveness of trade liberalization policy on the economic growth of the nation over the years.

General Public:

It will also educate the public on various government policies as related to trade issues.

1.8 Operational Definition of Terms

External Trade:

It is a system where the goods and services are advertised, sell and switched between two or more than two countries through import and export.

Foreign Portfolio Investment:

It is the entry of funds into a country where foreigners make purchases in the country’s stock and bond markets.

Exchange Rate:

It is the rate at which one currency will be exchanged for another. It is also regarded as the value of one country’s currency in terms of another currency.


It is the closer integration of countries and peoples of the world and the breaking down of artificial barriers to the flow of goods, services, capital, knowledge and people across national borders; a process of creating a global market of investments, trade and information through the integration of economic decision making on consumption, investment and savings across the world (Bank of Industry 2004:1)

Trade Liberalization:

This is the removal of or reduction in the trade practices that thwart free flow of goods and services from one nation to another. It includes dismantling of tariff (such as duties, surcharges, and export subsidies) as well as nontariff barriers (such as licensing regulations, quotas, and arbitrary standards).

Foreign Direct Investment (FDI):

This is an investment by multinational corporations in foreign countries in order to control assets and manage production activities in those countries. (Dutse 2008)

Economic Growth:

This is an increase in the capacity of an economy to produce goods and services, compared from one period of time to another.

Chapter Five

Summary of Findings, Conclusion and Recommendations

5.1 Summary of Findings

The study set out to investigate the impact of trade on the economic growth of Nigeria. Earlier contributions by scholars and various schools of thought showed supportive and contrary views that trade have positive impact on economic growth. Thus, in order to authenticate the earlier stand that trade favourably impacts on growth in the Nigerian economy; Export, import values, Foreign Direct Investment and real exchange rate were used as the explanatory variables or regressors while GDP growth rate was used as the dependent variable in an ordinary least squares regression process.

From the analysis in this work, GDP could be regarded as a term used to describe economic growth, which is one of the macroeconomic objectives. The following summary is made in respect to the findings discovered in the previous chapters.

From the above it is seen that:

  1. There is a significant impact of Export trade on the Nigerian economic growth
  2. There is no significant impact of Import trade on the Nigerian economic growth
  3. Foreign direct investment has an impact on the Nigerian economic growth
  4. Exchange rates have a positive impact on the Nigerian economic growth

The study has also thrown some light on the fact that the dependent variable are interrelated and that decisions in one variable will affect the other variable. The study had depicted the patter of non-oil export and import values Foreign Direct Investment and real exchange rate in Nigeria right from 1980 – 2013. The study also made some effort in examining the problems of foreign trade over the years. The project also provides some theories on external trade on economic growth. Since foreign trade favours countries that participate in it, this study also made mention of benefits that accrue to this participant. Despite the numerous benefits that accrue to nations as a result of trade, some countries go to the extent of restricting some irrelevant items; this also examined in this project. It could also be observed that Nigeria engages in external trade negotiation so as to stimulate the economy through foreign trade.

From this study, it could be observed that the Nigeria economy employed different strategy in stimulating its economy through foreign trade. This strategies span across different stages of the economic lifecycle with different outcome.

From the result above, export, import, foreign direct investment (FDI) and foreign exchange rate acts as an engine of growth in Nigeria. This is inconformity with the conclusion of Adewuyi (2002) who referred to foreign exchange rate as an engine of growth. The result did support the claim that Nigeria economy is export-led as against Obadan (1989) statement and Oviemuno (2007) findings. There is positive relationship between RGDP and foreign trade elements as reported by Oyejide (1975) in his study. Ezenwe (1979) said that foreign trade is the most dynamic sector of the economy since independence and as far as this study is concern, foreign trade has been dynamic in the sense that most of their determinants are positively related to real GDP. The result is also backed by the study conducted by Bairam (1988) and Perraton (1990) that concluded that growth performance of a country is a function of the values of its income elasticity of both exports and imports as supported by Shuchin Yang statement which said, ‘if the developing countries do not develop their export, it might mean slow economic growth’. From this, since the result has indicated a positive relationship between export and real output, this statement by Shuchin Yang could be said to be-worthwhile.

5.2 Conclusion

This study has examined the performance of foreign trade in relations to economic growth. It is therefore concluded that, conscious efforts should be made by government to fine -tune the various macroeconomic variables in order to provide an enabling environment to stimulate foreign trade.

5.3 Recommendation

Based on the findings of this research work, it is necessary that conscious efforts should be made by government to fine-tune the various macroeconomic variables in order to provide an enabling environment to stimulate foreign trade by engaging in more of export trade and in effect curtail on import trade which has a negative effect or strain the economy. First of all, there should be optimal control of trade through the borders of the economy. The underground economic activities of bunkering, smuggling, child and drug trafficking, and other related illegal activities should be properly checked. This will help the economy to fully account for every trade/transaction through the border and determine its impact on the output growth of the economy. In order to achieve this, governments trade policy must be liberal. Export promotion strategy should be review and import substitution strategy should also be review so that import and export will change its dimension. Also Nigeria government should strengthen the competiveness of exports by combing the imports of high technology and domestic independent research. The technological knowhow could be imported by direct buying or indirectly through foreign direct investment. However, the domestic absorptive ability in Nigeria is very weak. Therefore, Nigeria’s government should try to import appropriate technology which can easily be absorbed and acquired by domestic firms with their corresponding capability. It is equally important to develop strong domestic sector of competitive firms that can assimilate and disseminate imported technologies and to improve their own innovative capacities.

The government should encourage export diversification. Non-oil sector exports should be encouraged and concentration on oil sector export should be minimized. Expenditure on projects and infrastructures that would facilitate trade and economic growth should be encouraged, and the monetary authority should give priority to exchange rate stability.

Nigerian should reframe from excessive consumption of foreign goods and services so that their imports might be cut-off.

Manufacturing industries should improve on their production so that their output would be competitive in the global market. Excise duties should be lowered so as to encourage local industries to export their goods and services. Lifting of trade barriers on local output should not be followed by the introduction of new ones. Only the importation of capital goods that are essential should be encourages, since not all importation are necessary for economic growth.

The following recommendations are also made.

  1. For now, devaluation of the naira should be deemphasized. Much as the low exchange value of the naira would promote export and discourage import, it should be noted that not until the nation’s exports become those industrial goods and services whose foreign demand and domestic supply are elastic, the nation’s economy stand little chance of gaining from an unguided exchange rate deregulation policy. This remains true so long as the economy depends on primary products whose foreign demand and domestic supply are inelastic.
  2. The service industry should be explored as well. This gives a clarion call for educational development to boost the nation’s technological base.
  3. Serious surveillance and supervisory efforts should be stepped up to curb dumping activities of some foreigners and unpatriotic Nigerians who assist them. The role of NAFDAC and other law enforcement agencies in this battle is commendable and should be sustained.
  4. Democratic ideals should be encouraged so as to reduce the spate of instability in the general body polity. This is inherent in the fact that foreign investors are least attracted to a politically unstable economy.
  5. Nigeria is rich both in terms of resources and agricultural produce and as such, the locally based sources of raw materials should be strengthened to avoid the use of relatively expensive foreign raw materials.
  6. Finally, Nigeria government should focus on the catch up strategy by establishing a national innovation system which includes proper education, finance and industrial policy, which could promote openness and enhancing domestic absorptive capability, thereby increasing productivity of the economy.

5.4 Contributions to Knowledge

This study has brought to the fore the impact of external trade on growth of Nigerian economy. The following is a summary of the contributions the study has added to existing body of knowledge on the topic.

  1. The study establishes empirically, that external trade impact significantly on the growth of Nigerian economy. By implication issues on external trade should not be ignored in policy decisions aimed at promoting the economic development of Nigerian.
  2. The study also contributed in terms of geography because of the findings being based on Nigeria which differs from climes where substantiated studies had been carried out.
  3. The study establishes empirically, that foreign direct investments have non-significant on the growth of Nigerian economic growth, which indicates that there has been insufficient inflow of investment over the years. This calls for attention and direction of government policy that will encourage and increase foreign direct investment into Nigeria.

5.5 Areas for Future Studies

Following the areas this study has covered, the areas listed below are recommended for future studies by interested researchers of capital flows and investment in Nigeria.

  1. The impact of external trade on the standard of living in Nigeria.
  2. An empirical analysis of Trade in West African sub-regions and the impacts on their economic developments.
  3. External trade policy development in Nigeria and the impact on foreign direct investment.

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