With the creation of a single European currency, the dollar will have its first real competitor since it surpassed the pound sterling as the globe's dominant currency. As much as $1 trillion of international investment mal shift from dollars to fuses. The political impact of the euro will be lust as great. Europe could try to export its high unemployment by undervaluing the euro's initial exchange rate. Protectionist battles could break out. The euro's arrival need not cause instability in world markets, but it will probably cause volatility. A smooth transition to a stable dollar and euro system will require a quantum leap in transatlantic cooperation.