Earlier, I pointed out the two causes of the global economic slump: the acute symptoms sparked directly by the financial crisis and chronic illness due to balance sheet adjustments. The policy responses of Japan and other countries were taken to address these two causes.
Regarding the acute symptoms, many central banks took measures such as the purchase of particular financial assets in markets that had ceased functioning to prevent a worsening of the financial crisis and to ensure the flow of funds necessary for private economic activity, working to restore the functioning of markets.