Extrapolating dates for the sum of first and third harmonic of 51.6 year GDP K-wave gives low in 2011 and high in 2017. See “Profit Magic” for relationship between GDP and stock prices. The next downturn in the economy and stocks is likely to be a doozy. You didn’t think we could have all this candy without a stomach ache, did you?
Link to full paper is below.