Say's Law under discussion

The claim of those who dispute Say's law is that the money system does not have the range and precision to measure all inventory. Hence, some inventory gets over valued or under valued. That is true, but the inventory still exists and is still measured. Even if the measurement volatility is too high, the goods can still exist and have value on some other regressed monetary system.

Inventory has to rot away, be destroyed by police action, or become permanently obsolete to violate Say's law. A good that becomes permanently obsolete will never be measured for value even when money becomes equilibriated again.

It is also true that money technology can become obsolete relative to other technology.