I've never been remotely convinced by cycle models. Fourier Analysis shows you can model any curve by summing enough sine waves of different amplitudes and fre

I've never been remotely convinced by cycle models. Fourier Analysis shows you can model any curve by summing enough sine waves of different amplitudes and frequencies; so given any shape of any market over any time period, I can show a selection of long, medium and short cycles that will approximately match the market. But this will have zero predictive power.