From: "Phil Payne" 

"John Beamish"  wrote in message
news:op.tm92jzhrm6tn4t{at}dellblack.wlfdle.phub.net.cable.rogers.com...
> Sheesh ... it was intended as a general statement showing the necessity
> for trade.  One can always find some specific examples where there are
> substitutions (wind power for water power is but one example).

I'd suggest that wind has - over the centuries - ground more wheat than water.

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