Answer:
great depression
stock market history
Explanation:
stock market crashes
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1929 great depression: consumer spending and investment dropped, causing steep declines in industrial output and employment as failing companies laid off workers.
1987 black monday: by computer program-driven trading models that followed a portfolio insurance strategy as well as investor panic
2008 credit crisis : too many many mortgages were given to people with bad credit
data from these past crashes can help one guess if one is coming in the future
interest rate, inflation, dollar value
see the attached pic. its pretty good
