The S&P topped in June 2014, not May 2015, when variance in the international value of the dollar is considered. It should continue lower until the end of this year. It is interesting how this correlation has remained in straight channels up and down since at least the early 1990s.
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I also noticed in my research using other methods that the S&P 500 internally started to break down in 2014 and not in 2015 as most seem to think.