A HEAT map is a helpful way to quickly analyze lots of information for trends. They are useful in countless situations where users need to aggregate large amounts of data quickly. Today's S&P500 Heat Map is SO disturbing. Firms are shown by their relative size, and the color indicates how they are trading today. Bright red indicates that particular stock is down by at least 3%. Of the S&P 500 only 2 stocks are up by more than 3% today. Holy cow...
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