The technical flaws in Piketty’s argument are pervasive. When you dig, you find them. The fundamental problem is that Piketty does not understand how markets work. In keeping with his position as a man of the left, he has a vague and confused idea about how supply responds to higher prices. Startling evidence of Piketty’s miseducation occurs as early as page 6.
He begins by seeming to concede to his neoclassical opponents: “To be sure, there exists in principle a quite simple economic mechanism that should restore equilibrium to the process: the mechanism of supply and demand. If the supply of any good is insufficient, and its price is too high, then demand for that good should decrease, which would lead to a decline in its price.” The words I italicize clearly mix up movement along a demand curve with movement of the entire curve, an error of first-term college students. The correct analysis is that if the price is “too high” it is not the whole demand curve that “restores equilibrium,” but an eventually outward-moving supply curve. The supply curve moves out because entry is induced by the smell of super-normal profits.
Piketty does not acknowledge that each wave of inventors, entrepreneurs, and even routine capitalists find their rewards taken from them by entry. Look at the history of fortunes in department stores. The income from department stores in the late 19th century, in Le Bon Marché, Marshall Field, and Selfridge’s, was entrepreneurial. The model was then copied all over the rich world. In the late 20th century the model was challenged by a wave of discounters, and they then in turn by the internet. What happens is that the profit going to the profiteers is more or less quickly undermined by outward-shifting supply. The original accumulation dissipates. The economist William Nordhaus has calculated that the inventors and entrepreneurs nowadays earn in profit only 2 percent of the social value of their inventions. If you are Sam Walton the 2 percent gives you personally a great deal of money from introducing bar codes into stocking of supermarket shelves. But 98 percent at the cost of 2 percent is nonetheless a pretty good deal for the rest of us. The gain from macadamized roads or vulcanized rubber, then modern universities, structural concrete, and the airplane, has enriched even the poorest among us.
Deirdre N. McCloskey, “How Piketty Misses the Point”, Cato Policy Report, 2015-07.
September 3, 2017
QotD: Picketty’s misunderstanding of the supply and demand curves
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