A £300m surplus in the British balance of payments in 1950 turned into a £400m deficit in 1951, the most sudden reversal on record up until that time. This was caused partly by businesses switching to rearmament rather than generating exports. The other reason was a deterioration in the terms of trade: higher oil prices after the Iranian oil crisis caused an outflow of dollars, whilst prices of wool, tin and rubber fell so the rest of the sterling area was not earning so many dollars from exports. By the second half of 1951 the overseas sterling area was importing from North America at double the 1950 rate. By 1951 inflation was beginning to increase, the government budget surplus had disappeared, and in another sign of an overheating economy unemployment was down to 1945 levels. By the second half of 1951 Gaitskell was worried about the political effect of the higher cost of living, but the "Financial Times" and "The Economist" accused him of using higher prices to choke off consumption and free up resources for rearmament instead of consumer goods production.