a b s t r a c t a r t i c l e i n f oThis study develops comprehensive full-sector macro-econometric models for the Nigerian economy with the aim of explaining and providing a long-term solution for the persistent growth-poverty divergence experienced by the country. The models are applied to test the hypothesis of existing structural supply-side constraints versus demand-side constraints impeding the economic growth and development of the country. A review of the historical performance of the Nigerian economy reveals significant socio-economic constraints as the predominant impediments to high and sticky levels of poverty in the economy. Thus, a model which is suitable for policy analyses of the Nigerian economy needs to capture the long-run supplyside characteristics of the economy. A price block is incorporated to specify the price adjustment between the production or supply-side sector and real aggregate demand sector. The institutional characteristics with associated policy behaviour are incorporated through a public and monetary sector, whereas the interaction with the rest of the world is represented by a foreign sector, with specific attention being given to the oil sector. The models are estimated with time-series data from 1970 to 2006 using the Engle-Granger two-step co-integration technique, capturing both the long-run and short-run dynamic properties of the economy. The full-sector models are subjected to a series of policy scenarios to evaluate various options for government to improve the productive capacity of the economy, thereby achieving sustained accelerated growth and a reduction in poverty in the Nigerian economy.

The conventional policy models designed to tackle poverty have not been able to address the peculiar socio-economic and institutional conditions of the country or region in perspective. Much of the literature focuses on the macroeconomic determinants of poverty, leaving out non-economic factors that could be more important. In this milieu, this study empirically examines the relationship between governance, physical infrastructure, and the level of poverty in sub-Saharan Africa. The estimations are based on a panel of 19 selected sub-Saharan African countries over the period 1990-2010 using the two-stage least-squares estimation techniques. The results from the estimations portray robust parameter estimates and suggest that governance and infrastructure are significant determinants of poverty in the region. Furthermore, the study tends to detect that a sustainable level of poverty could be attained at particular governance and infrastructure rating after controlling for the level of gross domestic product and other factors across the region. Therefore, countries with better governance and infrastructure ratings will achieve lower poverty levels, and poverty tends to converge as physical infrastructure improvement and better governance are pursued.

This study empirically examines the pattern of domestic investment that is consistent with a neoclassical supply-side model of the Nigerian economy. The estimations are carried out with time-series data from 1970 to 2006 using the Johansen estimation techniques. The results conform to the findings of existing literature that real output, user cost of capital, and the level of financial development are significant determinants of domestic investment in Nigeria. The distinctive feature of the study is the significant role played by governance in explaining the longterm pattern of domestic investment in Nigeria. The results from the long-run estimation and the impulse responses revealed that a well-structured and stable socio-economic environment will boost domestic investment over the long run. Therefore, in modelling domestic investment for Nigeria, it is imperative to incorporate the significant role played by governance.

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Purpose The purpose of this paper is to examine the impact of migration on economic growth and human development in selected Sub-Saharan African (SSA) countries. Design/methodology/approach The estimations were carried out in a panel of 19 selected SSA countries over the period 1990-2013, using the two-stage least squares estimation techniques. Two measures of migration, namely stock of international migrants and the ratio of personal remittances received to personal remittances paid were used in the study to carry out this investigation. Findings The results conform to the findings of existing literature, namely that social expenditure, domestic investment, financial inclusion, income inequality, income and human poverty are significant determinants of either human development or per capita GDP in Sub-Saharan Africa. The distinctive feature of the study is the significant but negative role played by migration in explaining human development and economic growth in the region. The results from the panel estimations reveal that an increase in the measures of migration deteriorates the level of human development and growth of the region. Research limitations/implications The major limitation of this study is the unavailability of quality data on migration flows. Therefore, it would be imperative to reinvestigate the specifications adopted in this study in follow-up studies. Practical implications The study includes implications for policy makers, especially in SSA countries, that the pattern and flow of migration does not circulate within the region and has tended to drain out human capital to other regions of the world. In the same event, the stock of migrants residing in the region may be low-skilled migrants that do not contribute directly to the level of human development. Originality/value To assess the impact of migration on economic growth and development such as the SSA region, it is imperative to follow the growth-based, capacity-based and asset-based approaches to development. This study has made this distinction.