John Hussman, the president of Hussman Investment Trust, is known as a legendary investor for accurately predicting the dot-com bubble crash in 2000 and the 2008 financial crisis. Recently, he issued warnings again that the US stock market is in a bubble, with valuations being too high. He predicts the S&P 500 could plunge 65-70% for investors to face significant losses. This article analyzes his views and the rationale behind the warnings.

Basis of warnings – overvaluation signals bubble
Hussman’s warnings stem from his assessment that valuations have reached extreme levels indicating a market bubble. Specifically, he uses the metric of total market capitalization to gross value added, which he finds most correlated with actual subsequent market returns. The current levels are higher than those in 2000 and 2008 bubbles. Hence, he believes investors are complacent about overvaluation risks.
Quantitative market return predictions
Hussman makes predictions by quantitatively estimating future market returns based on current valuations. His analysis shows S&P 500 returns to be around -6% annualized over next 12 years. So he firmly believes there will be negative returns for stock indices over the next decade if valuations stay elevated.
Potential economic triggers identified
While concerned about valuations, Hussman also tries identifying potential economic triggers that could burst the bubble. He points to risks like growth slowdown as fiscal support fades, without corresponding increase in consumer spending. So there are some identifiable risks that could catalyze the crash he predicts.
In summary, Hussman bases his dire warnings primarily on overstretched valuations signaling a stock market bubble, along with high risks of an economic trigger catalyzing a crash. Given his impressive track record, the warnings merit close investor attention.