by From The Economist’s economics brief on Say’s Law: Supply gives people the ability to buy the economy’s output. But what ensures their willingness to do so? According to the logic of Say and his allies, people would not bother to produce anything unless they intended to do something with the proceeds. … Even if people chose to save not consume the proceeds, Say was sure this saving would translate faithfully into investment in new capital … But what if the sought-after thing was [money] … as a store of value, to be held indefinitely? A widespread propensity to hoard money posed a problem for Say’s vision. It interrupted the exchange of goods for goods on which his theory relied. … And if, as he had argued, an oversupply of some commodities is offset by an undersupply of others, then by
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Dirk Niepelt considers the following as important: Notes, Say's law
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From The Economist’s economics brief on Say’s Law:
Supply gives people the ability to buy the economy’s output. But what ensures their willingness to do so? According to the logic of Say and his allies, people would not bother to produce anything unless they intended to do something with the proceeds. … Even if people chose to save not consume the proceeds, Say was sure this saving would translate faithfully into investment in new capital …
But what if the sought-after thing was [money] … as a store of value, to be held indefinitely? A widespread propensity to hoard money posed a problem for Say’s vision. It interrupted the exchange of goods for goods on which his theory relied. … And if, as he had argued, an oversupply of some commodities is offset by an undersupply of others, then by the same logic, an undersupply of money might indeed entail an oversupply of everything else.
Say recognised this as a theoretical danger, but not a practical one.