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If there where real periodic cycles you could predict if the US economy where Up or Down with above random odds for July 4th, 2050. Nobody can, because what you call periodic is something else. Another way of saying it is there where say a X year cycle to the economy it would be a very famous result.

(Ignoring seasonal variation.)

> are subject to periodic, as well as quasiperiodic, chaotic, and exogenous forcing functions.

Isn't that what random is?

Even the Black-scholes models it as random motion.