81.   Traders need government approval if they want to buy and sell the currency for investments.

82.   Under an agreement among the various nations, central banks were required to buy or sell their currency to keep the value at its agreed-upon level.

83.   When a crisis arrives, people start selling the currency to the government, which obligingly buys it and drains foreign exchange reserves.

84.   When the Mexican peso collapsed last December, the shock spread through Latin America as investors rushed to sell local currencies in expectation of other devaluations.

85.   When they sell Canadian bonds and move their assets outside the country, they usually sell the currency too.

86.   When traders sell European currencies, they usually buy dollars and sell them for marks, which pushes down the dollar.

87.   When traders sell the currency in large volumes, the board can act to raise interbank interest rates, which draws dollars back into the system.

88.   A futures contract obligates a trader to buy or sell a currency at a fixed price at a specific time in the future.

89.   A forward contract in this case is an agreement to buy or sell currencies for settlement at a specified period in the future.

90.   Banks, speculators and other holders of baht sold the currency, expecting it to lose value.