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Came across this this morning and found its premise very interesting.
Comparing the economy to an engine means that it's made up of parts that interact in precise ways and that, if they break down, can easily be fixed by smart technicians. It suggests that pushing the right buttons and flipping the right switches, adding the right mix of fuel in the proper amounts will keep it running smoothly.
The metaphor ends up driving reality, and economic policy prescriptions. Yet these policy prescriptions almost never work as intended. Stimulus plans don't stimulate. Fed rate hikes often cause the recessions they're supposed to prevent. As Paul Krugman put it, "bad metaphors make for bad policy."
The more accurate metaphor for the economy is an ecosystem.
"The economy is too complex to be engineered," noted Max Borders in an article for the Library of Economics and Liberty. "It is dynamic and organic. "
"We can no more fix an economy," he says, "than we can fix a rain forest or a coral reef. At best, we can leave it alone."
Andrew Coyne, writing in Canada's National Post, makes the same point. "Leave its self-equilibrating processes to work, and watch it flourish. Start monkeying about at one end, on the other hand, and be prepared for all sorts of unintended effects to spread throughout."