Understanding Say's Law

Steven Horwitz:

My task here is to explore the way in which Say’s Law of Markets (named for the great Classical economist Jean-Baptiste Say) has been fundamentally misunderstood by economic theorists and laypersons alike, and to explore some of the consequences of this misunderstanding.

W. H. Hutt once referred to Say’s Law as the most fundamental ‘economic law’ in all economic theory. In its crude and colloquial form, Say’s Law is frequently understood as supply creates its own demand, as if the simple act of supplying some good or service on the market was sufficient to call forth demand for that product. It is certainly true that producers can undertake expenses, such as advertising, to persuade people to purchase a good they have already chosen to supply, but that is not the same thing as saying that an act of supply necessarily creates demand for the good in question. This understanding of the law is obviously nonsensical as numerous business and product failures can attest to. If Say’s Law were true in this colloquial sense, then we could all get very rich just by producing whatever we wanted.

read all