Taking Wall Street's temperature... The S&P 500 boils down the stock prices of the 500 "most valuable" publicly traded companies on American exchanges into a single number. That number helps us quickly answer the question: “How is the US stock market doing?” Here's how the S&P 500's "temperature" changed from February 19th to February 28th (last Friday):
This isn't the same as '08... Back then, a financial crisis was caused by deep internal problems with our economy (a housing market bubble and massive debt). The threat this time is external: COVID-19 (aka coronavirus) had already shut down big chunks of the Chinese economy — but last week, the economic disruption spread to Italy, South Korea, and Iran.
Uncertainty is the market's illness... This public health outbreak could be a major hit to the economy, or it could be a blip on the freakout radar. Instead of gambling on those two outcomes, many investors have sold out of risky assets (stocks). The 10-Yr Treasury yield fell to a record low rate, meaning investors are piling into relatively safer government bonds because of uncertainty.