angola the largest exporter among the ldcs had to take a billion loan from the international monetary fund imf in to stabilize its macroeconomic balance following the steep fall in oil prices after the outbreak of the international economic crisis a new decline in prices reduced revenues from oil taxes from per cent of gdp in to per cent in imf b such taxes are implemented by most governments because raising fuel taxes is easier than collecting income and other taxes and fuel consumption is weakly priceelastic kojima