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The Bank of Japan started investing in stocks during the financial crisis of 2009. It has increased its investments in Japan's stock market during the pandemic as a way to boost spirits in the stock market to $400 billion as of Sept. 30, 2020.  Of this $56 billion is a gain in the stock market after Japan's stock market gained 60% from a deep low during the early period of the pandemic. In March Governor Haruhiko Kuroda doubled the ceiling for BOJ to $115 billion for purchases of exchange traded funds.

The purpose of this activity is to encourage risk taking in the broader economy, and ensure prices are rising at a small but steady pace. The BOJ now owns 6% of the total value of the Tokyo stock market. The BOJ does not buy individual funds but invests in the market through exchange traded funds. The BOJ purchases were effective in easing uncertainty and promoting confidence as the pandemic surged in Japan and in the rest of the world.