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Is there a message in the 300+ year old chart?

In a recent posting (The Coming Depression: See It Clearly Through Historical Eyes Feb 23, 2009), James Wood published a chart courtesy of James Flanagan of Gann Global Financial:

James Flanagan of Gann Global Financial

If the dates are extracted from the chart and schematically put in relationships of Kondratieff’s Long Wave, interesting observations emerge (see tables below). It appears that the cycles of each Wave since 1730 are shortening, including the +/- difference among cycle pairs. If this relationship pattern continues, the projected end of the current Long Wave may not occur until 2028.