All prices are relative. So when the price of one thing goes down, that is exactly the same as the prices of everything else going up. So every market "crash" of some assets is a "boom" of other assets.
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But as Keynes observed, it's bad when the boom is in money (deflation), because you can't eat money.
Booms and busts of prices are not booms and busts of supplies. Deflation doesn't directly affect food supplies. Only through much-debated & likely irrational indirect channels.
