This study reexamines the validity of long-run purchasing power parity (PPP) hypothesis using a battery of panel unit root tests for 11 developing countries in Africa over the period 1980-2007. Based on the conventional panel unit root tests, we found evidence that the monthly real exchange rates in these countries were mean reverting. By contrast, the series-specific unit root test proposed by Breuer et al. (SURADF) reveals that only six of the 11 RERs series were stationary using the US dollar as reference currency. Additionally, our results reveal that there is stronger evidence of the parity condition with the Rand-based rates than in the other currency-based rates like the US dollar or Euro. We conclude that PPP holds in some, but not all, of the African countries according to the SURADF tests. JEL Classification: F31, C22, C23

The article examines the role of lending rates, imports and growth on the duration of self-employment in Zimbabwe while the country embarked on trade liberalisation. The variables were selected because of their importance as policy variables in reform programmes and also their importance to small entrepreneurs. Previous research has established the importance of an initial endowment and other measures of human capital on entry into self-employment as well as growth of the respective enterprises. We show that such initial conditions do not always give robust results. Instead, duration of self-employment is negatively related to higher lending rates, increased imports and structural change, but responds positively to growth.lending rates, imports and growth, self-employment in Zimbabwe, trade liberalisation, reform programmes,

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Empirical studies on self-employment uniformly cite the high mortality rate in both developed and developing countries. Several studies on the entry into self-employment incorporate a savings constraint. Policy makers and international aid agencies have responded by providing credit to would-be entrepreneurs yet the mortality rate persists. We formulate a model of the viability of self-employment that incorporates the impact of cost perceptions at the time of entry. We use the ability to meet monthly loan repayment ratios as a measure of viability since loans are usually the largest explicit cost. Our results have important policy implications on the desirability of interest rate subsidies, the size of initial capital relative to market size and criteria for granting additional credit to existing enterprises.