They must either fully fix their currency, to the dollar, say, through a currency board or dollarisation, or they must allow it to float freely.

ECONOMIST: Intervention: divine or comic?

Various attempts to fix one European currency against each other, such as the Exchange Rate Mechanism, crumbled in the face of divergent economic performances in the countries concerned.

ECONOMIST: Currencies

Hedging allows companies to fix the price of a currency months in advance.

BBC: Launching new models ate into BMW's finances