Currencies will alter to changes in trade balances. Greater fuel prices will result in an increase in the value of the dollar ,therefore, oil exporters invest their windfall earnings in US dollar controlled assets and transactions demand for dollar rises. A stronger dollar will increase the cost of servicing the external debt of oil-importing poor nations, while this debt is denominated in dollars , compounding the economic hit caused by greater fuel prices. It will also strengthen the affect of higher oil prices increases the oil-import bill in the short-run, with the low price elasticity of oil demand . Oil shocks that world has experienced , provoked debt-management crisis in many poor nations.