“…Later, Clague (1986aClague ( , 1986b investigated, for a sample of 31 countries in 1975 (ICP Phase III), the extent to which differences in country rankings derived from choosing the PPP or the exchange rate as a converter of national GDP into a common currency (US$) could be attributed to the endowment of natural resources (share of minerals in GDP), the international position of a country (as measured by the trade balance and tourist receipts), productivity differentials in services (proximated by educational attainment level), and macroeconomic policies (measured by the growth of money supply). A further exploration for a 60-country sample was carried out by Clague (1988) for 1980 (ICP Phase IV). The latest attempt to provide short-cut alternatives to the KHS method has been carried out by Ahmad (1996) for different data sets from ICP Phases III, IV, and V (covering 34, 60, and 56 countries in 1975IV, and V (covering 34, 60, and 56 countries in , 1980IV, and V (covering 34, 60, and 56 countries in , and 1985, firs separately and then pooled.…”