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"The Market Can Remain Irrational Longer Than You Can Remain Solvent"

Attributed to economist John Maynard Keynes:

People like to misinterpret Keynes, so it is worth stressing the "can" does not mean that it will in a strict sense.

Similarly, "We're all dead in the long run," does not mean that whatever long run effect being discussed will wait until after we are dead either.