There was still an open gold market. For the Bretton Woods system to remain effective, the fix of the dollar to gold would have to be adjustable, or the free market price of gold would have to be maintained near the $35 official foreign exchange price. The larger the gap, known as the gold window, between free market gold price and the foreign exchange rate, the more tempting it was for nations to deal with internal economic crises by buying gold at the Bretton Woods price and selling it in the gold markets.