Since 2020, the iconic Dow Jones Industrial Average (DJINDICES: ^DJI), broad-based S&P 500 (SNPINDEX: ^GSPC), and growth-focused Nasdaq Composite (NASDAQINDEX: ^IXIC), have bounced back and forth between bear and bull markets. Although there isn't any one indicator that can, with 100% accuracy, forecast what's to come in the short run for Wall Street, there are quite a few economic datapoints that have an uncanny track record of predicting short-term directional movements in the Dow Jones, S&P 500, and Nasdaq Composite. One such metric that should be raising some eyebrows is U.S. money supply.