This guy runs $224B and just said the S&P 500 will make zero through 2036. This is Howard Marks. The guy who called the dot-com top with a memo dated January 2, 2000. He's explaining the JP Morgan chart that plots historical returns against S&P 500 forward PE. Right now, forward PE sits at 20.9. The forward 10-year return at that multiple? Between minus 2% and plus 2%. Zero. But the chart already failed once. In December 2014 the S&P traded at 16x forward earnings. The chart predicted 5 to…