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.

Recent data from the National Bureau of Statistics (NBS) show that total capital importation in 2015 fell steeply by 53.5 per cent from $20,750.76 million in 2014 to $9,643.01 million in 20152. This decline was largely driven by a substantial drop in portfolio investment (the largest component of Capital Inflows), which fell by 59.74 percent. The exclusion of Nigeria from the JP Morgan EM Bond index, the slump in crude oil prices, the decision of the US Federal Reserve to raise interest rates and the capital control measures imposed by the Central Bank of Nigeria (CBN) are the notable drivers of the reduced inflow of capital. Going forward, improving the business environment, especially easing foreign exchange controls, would determine the extent to which the economy can attract increased capital inflows.