Proteccionismo e recessões

The Donald and the Veg-O-Matic, por Paul Krugman (9 de abril):

But too many anti-Trump critics seem to have settled on one critique that happens not to be right: the claim that a turn to protectionism would cause vast job losses. Sorry, that’s just not a claim justified by either theory or history.  

Protectionism reduces world exports, but it also reduces world imports, so that the effect on overall demand is a wash; textbook economic models just don’t say what conventional wisdom is asserting here.

Robber Baron Recessions, por Paul Krugman (18 de abril):

In recent years many economists, including people like Larry Summers and yours truly, have come to the conclusion that growing monopoly power is a big problem for the U.S. economy — and not just because it raises profits at the expense of wages. Verizon-type stories, in which lack of competition reduces the incentive to invest, may contribute to persistent economic weakness. 

The argument begins with a seeming paradox about overall corporate behavior. You see, profits are at near-record highs, thanks to a substantial decline in the percentage of G.D.P. going to workers. You might think that these high profits imply high rates of return to investment. But corporations themselves clearly don’t see it that way: their investment in plant, equipment, and technology (as opposed to mergers and acquisitions) hasn’t taken off, even though they can raise money, whether by issuing bonds or by selling stocks, more cheaply than ever before. 

How can this paradox be resolved? Well, suppose that those high corporate profits don’t represent returns on investment, but instead mainly reflect growing monopoly power. In that case many corporations would be in the position I just described: able to milk their businesses for cash, but with little reason to spend money on expanding capacity or improving service. The result would be what we see: an economy with high profits but low investment, even in the face of very low interest rates and high stock prices. 

And such an economy wouldn’t just be one in which workers don’t share the benefits of rising productivity; it would also tend to have trouble achieving or sustaining full employment. Why? Because when investment is weak despite low interest rates, the Federal Reserve will too often find its efforts to fight recessions coming up short. So lack of competition can contribute to “secular stagnation” — that awkwardly-named but serious condition in which an economy tends to be depressed much or even most of the time, feeling prosperous only when spending is boosted by unsustainable asset or credit bubbles.

E creio que, na sua coluna de 18 de abril, Krugman (suponho que involuntariamente) refuta o seu post de 9 de abril - afinal, se o crescente "poder de monopólio" causa recessões, então o proteccionismo (ao reforçar o "poder de monopólio" das empresas de cada país, que passam a estar menos sujeitas à concorrência de empresas similares de outros países) irá contribuir para as recessões e para o desemprego.