The article looks at how the Bank of Japan and other major central banks have used different strategies to boost the economy during financial crises. They tried things like giving hints about future interest rates, buying specific assets, and pumping money into the system. The measures mostly worked to raise asset prices, but they didn't do much to stop Japan's economy from shrinking. The strategies didn't weaken Japan's currency as expected. Despite some positive effects, the measures didn't fully solve Japan's economic problems.