The lesson Jim Cramer wants investors to learn from Monday's market rally

CNBC's Jim Cramer on Monday reminded investors about the forces that truly move the stock market."Stocks don't go down because people are in a bad mood," Cramer said on "Mad Money." "They go down because something goes wrong that impacts their businesses, and that something tends to elude investors both big and small." The trading action over the past 24 hours illustrates this point, according to Cramer. It started with a sharp drop in S&P 500 futures on Sunday night, following a weekend filled with politic ...