BoJ's Monetary Base Drops by Record 13.8% Amid Shrinkage of Central Bank Cash

Japan's monetary base took its largest drop since 2007 in July, falling by 13.8% from the same period last year, according to new data from the Bank of Japan.

The monetary base is a key indicator of the central bank's influence on the economy, encompassing cash in circulation and deposits held by commercial banks at the BoJ. This month's decline was more pronounced than June's and exceeded economists' expectations.

The largest contributor to this decrease was not households reducing their cash usage, banknotes fell 1.9% year-on-year, while coins slipped 1.1%, but rather a significant drop in current account balances held by commercial banks at the BoJ, which decreased by 16.6%, and reserve balances, which dropped by 15.3%.

Markets may take notice of this development as it could lead to increased short-term funding costs for banks. As the pool of settlement cash shrinks, banks become more sensitive about borrowing and lending overnight, potentially nudging short-term interest rates higher.