Public expenditure has increasingly grown over time to fulfill three main roles: protecting society, protecting individuals, and funding public works. The growth can be attributed to several causes like increased income, welfare state ideology, effects of war, increased resources and ability to finance expenditures, inflation, and effects of democracy, socialism, and development. There are also canons that govern public spending like benefits, economy, and approval by authorities. The effects of public expenditure include impacts on consumption, production through efficiency, incentives and allocation, and distribution of resources.