Say's law
Some proponents of Say's law argue that such intervention is always counterproductive. Consider Keynesian-type policies aimed at stimulating the economy. Increased government purchases of goods (or lowered taxes) merely "crowd out" the production and purchase of goods by the private sector. Contradicting this view, Arthur Cecil Pigou, a self-proclaimed follower of Say's law, wrote a letter in 1932 signed by five other economists (among them Keynes) calling for more public spending to alleviate high levels of unemployment.