An Excel Forecast: Can S&P 500 Monthly Closes Predict the Future?

Out of curiosity, I was thinking if Excel could forecast the stock market.  We know Excel’s Forecast is a function of making predictions by using the historical data and analyzing trends.  Can the S&P 500 historical data shed some light on the future?  Maybe or maybe not.  I would like to think so because the price movement follows a pattern – when it gets too expensive, the price comes down, or vice versa.  The equilibrium price is the price that buyers and sellers agree.  Timing is something we can not predict.

I took the S&P 500 monthly closes from Yahoo Finance from 3/1/2010 to 2/12/2021 and put them in Excel.  Here’s what Excel forecasts.

Untitled3 Out of curiosity, I was thinking if Excel could forecast the stock market.  We know Excel's Forecast is a function of making predictions by using the historical data and analyzing trends.  Can the S&P 500 historical data shed some light on the future?  Maybe or maybe not.  I would like to think so because the price movement follows a pattern - when it gets too expensive, the price comes down, or vice versa.  The equilibrium price is the price that buyers and sellers agree.  Timing is something we can not predict.

Ignore the timing factor even though it predicts an immediate sharp pullback of the S&P 500.  However, the long term outlook still looks rosy.  

The bigger question is whether S&P keeps going up from this point and then starts a major correction later this year or next year, or is a major correction imminent?

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