Grand supercycle

A Grand Supercycle is the longest period, or wave, in the growth of a financial market as described by the Elliott Wave Principle, originally discovered and formulated by Ralph Nelson Elliott. Elliott speculated that a Grand Supercycle advance had started in the United States stock market in 1857 and ran to the year 1928, but acknowledged another interpretation that it may have been the third or even the fifth Grand Supercycle wave. However, these assignments have been reevaluated and clarified using larger historical financial data sets in the works of A. J. Frost and R.R. Prechter, and the start is now considered to be 1789, at which time the stock market data begin.