African countries have been left out of the recent benefits accruing from international trade. For example, they accounted for only 3.2 percent of world trade in 2013 compared to 5 percent in the mid-1960s. Regional integration can reverse this weak performance as it holds the promise for countries to gain from the resultant economies of scale and enhanced competitiveness. It will also help to expand the markets for foreign direct investment.

Recently released GDP figures reveals that the three major sectors recorded positive and negative growth rates individually in 2017Q2. Firstly, Agricultural sector grew Year on Year by 3.01 percent, down from 3.39 percent in 2017Q1- driven by weaker output in crop production and Fishing sub-sectors. This is not unconnected with the planting season and the shortage of grainsfor livestock/fish respectively.

This study examines the hedging effectiveness of portfolio investment diversification between developed and developing economies; with focus on the Nigerian stock asset vis--vis the stock assets of the United States (US) and United Kingdom (UK). Its main contribution is in the analysis of optimal portfolio diversification using optimal portfolio weight (OPW) and optimal hedging ratio (OHR). Empirical findings show that the OPW and OHR are low, which indicates impressive potential gains from combining Nigerian stock assets in an investment portfolio with US and UK stock assets. In addition, exchange rate volatility is found to pose stern limitation on the potential benefits of this portfolio diversification arrangement. It is therefore recommended that the monetary authority in Nigeria should pursue policies towards reducing exchange rate volatility to the barest minimum. This will possibly attract more investors from developed economies who might be willing to combine Nigerian stock in their investment portfolio to minimize portfolio risk.