This paper investigates the impact of long-run terms-of-trade shocks. Analytically, we show that, if capital goods are largely importable or the labor supply is sufficiently elastic, then natural-resource booms increase aggregate investment and worsen the current account, but Dutch ‘Disease’ effects are weak. We then examine 18 oil-exporting developing countries during 1965-89. Favorable terms-of-trade shocks increase investment and (especially government) consumption, but reduce medium-term savings; hence, the current account deteriorates. Nontradable output increases, in response to real appreciations, but Dutch Disease effects are strikingly absent. Investment, consumption, and nontradable output respond more to a terms-of-trade decline than to an increase.