The stock market's biggest bear calls out a huge investing mistake that could have 'brutal consequences' ' and explains how it will cause the next market crash

John Hussman, the outspoken investor and former professor who has been predicting a stock market crash, calls out a big mistake he says investors are making as valuations continue to climb.He sees this dynamic specifically playing out in the tech sector, which has been largely responsible for market gains in recent months, leaving them that much more vulnerable.In the stock market, the concept of valuation can mean different things, depending on the investor.To novices, it's frequently used as a simple barometer of when an investment gets overextended. Conventional wisdom there suggests once valuation gets stretched too far, it might be time to sell.But to seasoned experts like John Hussmana former economics professor who is now the president of the Hussman Investment Trustassessing valuation is more nuanced.He subscribes to what he calls the Iron Law of Valuation, which says the higher the price investors pay for future cash flow, the lower their long-term investment returns will be. In other words, if you arrive late to the party, don't expect to get the full experience.It's a relatively basic concept that informs Hussman's view that irrational investor behavior will eventually lead the market to its doom. Piggybacking off the Iron Law, he points out that as prices have surged, people still seem ...Sponsored: If you enjoyed reading this story so far, why dont you join Business Insider PRIME' Business Insider provides visitors from MSN with a special offer. Simply click here to claim your deal and get access to all exclusive Business Insider PRIME benefits.SEE ALSO:A bizarre stock-trading strategy that's made a killing for investors this year is showing no signs of slowing ' here's how to replicate itJoin the conversation about this storyNOW WATCH: Brazil's empty $300 million World Cup stadium
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