Friday, June 9, 2023

The Fallacy Of “Fixed Pie” Debunked

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Over at mises.org, Matt Palumbo takes down the popular fallacy of fixed pie that claims that if one has a dollar more, that only means someone has one dollar less. That the rich can grow rich only of somebody else gets poorer. This is very popular, not among the laypersons; but even a former Harvard President, Larry Summers, also believes in it. No wonder the US is in decline.

“A good chunk of the debate over inequality today centers around what Milton Friedman identified as “the tendency to assume that there is a fixed pie, that one party can gain only at the expense of another.” This fallacy is one that any student of economics is familiar with, but the layman may not be: the fixed pie fallacy. The fixed pie fallacy is synonymous with the zero-sum fallacy in economics: that anyone’s benefit comes at someone else’s expense. In other words, if one person earns a dollar, someone else is worse off by a dollar. We know the logic behind the fallacy is faulty because if it were true, no transactions would take place. People aren’t so misinformed that they would remain blind to coming out the loser in half the transactions they take part in.

Well, maybe I’ve spoken too soon in saying that only the layman would be unfamiliar with this fallacy. Weighing in on the income inequality debate in a piece at the Financial Times, former Harvard President Larry Summers attempted to quantify how much better off most Americans would be had inequality remained at 1979 levels. “If the US had the same income distribution it had in 1979, the bottom 80 per cent of the population would have $1tn — or $11,000 per family — more. The top 1 per cent $1tn — or $750,000 — less,” writes Summers.

Quoctrung Bui of NPR reported on Summers’s argument and broke it down even further, estimating the benefits by income quintile. Under the 1979 income distribution, the bottom 20 percent would be earning $3,282 more, the next 20 percent $6,928 more, the middle 20 percent $8,752 more, and the next 19 percent would be earning $17,311 more. This only leaves the demonized top 1 percent, which would be earning $824,844 less.

Bui was intellectually honest enough in his reporting of Summers’s argument that he included this comment: “Of course, this is a purely theoretical exercise. It combines two different worlds: an economy as big as today’s, but with 1979 levels of inequality. Some economists would argue that this could never exist, because economic growth has been driven by forces, such as globalization and technological change, that have also driven up inequality.” A question that must be answered is whether or not the economic pie would be smaller, the same size, or larger had inequality not risen by the same extent since the late 70s. The consensus among rich countries is the last option: that inequality, contrary to popular belief, actually promotes growth. Quoting Harvard economist Robert Barro in the Journal of Economic Growth, “higher inequality tends to retard growth in poor countries and encourage growth in richer places.” Even Jared Bernstein in a report for the liberalCenter for American Progress stated “there is not enough concrete proof to lead objective observers to unequivocally conclude that inequality has held back growth.”

Since we know that rising inequality has promoted growth above what it has otherwise been, we can’t simply look at economic output today and figure out how much each quintile would be earning had the income distribution remained at its 1979 levels. A good exercise would be to compare current levels of output and earnings distribution against the counterfactual: a smaller economy with 1979 levels of distribution.” (from the article)

Read whole article here.

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