Stoney!!!!!!!!
What's it all mean?
Buffett Indicator Model: Strongly Overvalued
The Buffett Indicator is the ratio of total United States stock market valuation to GDP. As of November 4, 2021 we calculate the Buffett Indicator as:
Aggregate US Market Value: $51.1T
Annualized GDP: $23.7T
Buffett Indicator: $51.1T ÷ $23.7T = 216%
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P/E Ratio Model: Strongly Overvalued
The P/E ratio is a classic measure of any security's value, indicating how many years of profits (at the current rate) it takes to recoup an investment in the stock. The current S&P500 10-year P/E Ratio is 39.3. This is 96% above the modern-era market average of 19.6, putting the current P/E 2.7 standard deviations above the modern-era average. This suggests that the market is Strongly Overvalued. The below chart shows the historical trend of this ratio. For more information on this model's methodology and our analysis, keep reading below.
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S&P500 Mean Reversion Model: Strongly Overvalued
Overview
We find that the S&P500 is currently trading 96% above its modern-era historical mean, (about 2.7 standard deviations) indicating that the market is Strongly Overvalued.
Theory & Data
Mean Reversion
Mean reversion is the fairly unsophisticated concept that "what goes up must come down". It is generally true that while the day-to-day movements of the stock market are chaotic and unpredictable, long term stock market returns tend to adhere to somewhat predictable upward trends. Deviations from the trend can last years, or even decades, so this is not a helpful short term trading strategy - rather, a useful indicator of overall market valuation relative to modern history.
S&P500
We use S&P500 daily close data, available from Yahoo Finance back to 1950. This data is not inflation adjusted, so we index it to current dollars using CPI data from the US Bureau of Labor Statistics. One could just as easily use other broad market indices (Russell 2000, Wilshire 5000) and get very similar results. We use the S&P simply because we've already used the Wilshire 5000 in our Buffett Indicator analysis, and since this is such a high-level indicator we're comfortable using the S&P as a more narrow proxy of overall market valuation. The S&P also tends to be the measure more people are familiar with, so this indicator may be more relatable. The data is shown below, along with an exponential regression line showing the trend.