Bernard de Mandeville (1670–1733) famously (or infamously) suggested that the cause of wealth is vice. If everyone were perfect, Mandeville thought, no one would demand anything. Everyone would be content with little. With no aggregate demand, no production would arise to meet that demand. If no one drinks beer, no brewing industry would exist. No brewing industry would mean no growing of hops and barley, thus no farmers, no market for bottles or cans, no Clydesdales, nor anything refreshing to drink at baseball games.
Read Source: How Do We Help the Poor