Monetary policy pertains to the regulation, availability, and cost of credit, while Fiscal policy deals with government expenditures, taxes, and debt. Through management of these areas, the Ministry of Finance regulated the allocation of resources in the economy, affected the distribution of income and wealth among the citizenry, stabilized the level of economic activities, and promoted economic growth and welfare.

The Ministry of Finance played an important role in Japan's postwar economic growth. It advocated a "growth first" approach, with a high proportion of government spending going to capital accumulation, and minimum government spending overall, which kept both taxes and deficit spending down, making more money available for private investment. Most Japanese put money into savings accounts, mostly postal savings.