MichaelGR comments on Rationality Quotes: June 2011 - Less Wrong
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-Milton Friedman story
For the record, I'm pretty sure this story is apocryphal, though that doesn't take away from it's value as a rationality quote.
Seems like more of a libertarianism quote to me.
It can be that, but I think it also illustrate the importance of understanding people's real goals and intentions and not assuming that they are what they appear to be at first glance.
A few points come to mind:
"They" is the tricky bit there. Presumably some people wanted a canal, and some people other people wanted jobs, and for that matter presumably some people wanted money to go to the construction company who've got an opening for a government liaison consultant coming up in five years time. There's little reason to think the equilibrium is welfare maximising.
Probably, but Brazzy's explanation without adding all those other variables fits well enough to show why Milton's statement might have been missing something important. The point of a jobs program is that society pays some cost (of not using the most optimal method, i.e. more machines and fewer workers) in order to keep its members out of the unemployment trap. To propose, even as a deliberate reductio ad absurdum, that this would go just as well with spoons rather than shovels is not rationality, it's Spock-logic.
Now I'm quite willing to suppose that he understood the usefulness of such programs as an economist and overall had good reasons to see them as not worth it, or that some other measure would do better, but that particular quote fails to show it.
The earliest known citation of the anecdote is from 1935, quoting Canadian William Aberhart. Milton Friedman certainly told the story, and may have invented the somewhat snappier form quoted here. (Interestingly, William Aberhart was speaking for the Social Credit Party, which was hardly libertarian.)