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      Thus investment is everything that remains of production after consumption, government spending, and exports are subtracted. I is divided into non-residential investment (such as factories) and residential investment (new houses). In addition, several critiques of mainstream economics begin from the argument that current economic practice does not adequately measure welfare, but only monetized activity, which is an inadequate approximation of welfare. The definition of economics in terms of scarcity suggests that resources are in finite supply while wants and needs are infinite. Australian tycoon Kerry Packer was particularly fond of the game, having won and lost large sums over the years