The Bank of Japan reported that the amount used to intervene in the foreign exchange market last Friday was approximately 34 billion USD.

The central bank's account shows that Japan likely spent about $34 billion last Friday to intervene in the foreign exchange market to support the yen, following coordinated actions with the United States the day before. According to a comparison of accounts released by the Bank of Japan on Monday and forecasts from currency brokers, the scale of this operation is estimated to be around 5.33 trillion yen. Japan's Finance Minister Suematsu Katayama confirmed earlier on Monday that Japan entered the market last Friday. The Japanese authorities' continued purchases of yen highlight their determination to combat short-selling speculators. The exchange rate of the yen against the dollar fell to the lowest level in 40 years last month. The U.S. Treasury also joined in supporting the yen last week, marking the closest coordination on exchange rate policy in 15 years. An analysis of the Bank of Japan's accounts did not reveal the scale of U.S. intervention in the market, but with the presence of Washington, Japan could achieve the same effect on the yen with less funding.