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Paul Tudor Jones warns of a looming US market crash

A 30% stock plunge could erase nearly a year's worth of US economic growth. With debt soaring, the government's options are dangerously limited.

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The image shows a crossword puzzle with the words "loss, risk, and risk" spelled out on top of a newspaper. The paper is filled with text and numbers, suggesting that the puzzle is related to financial planning and risk management.

Paul Tudor Jones warns of a looming US market crash

One legendary Wall Street investor is warning that today's stock market offers chilling parallels to some of the worst meltdowns of the past century.

Paul Tudor Jones - the billionaire hedge fund manager who founded Tudor Investment Corp in 1980 and famously predicted the 1987 market crash - warned that the surging stock values might actually be a reason to worry.

In a video interview, Jones argued that the US economy has become more dependent on stock prices than at any time in history - and that exposes ever more Americans to the inevitable reality of a stock market crash.

'Are we in a bubble? I don't know if we're necessarily in a bubble,' said Jones.'[But] we're so dependent upon firm equity prices.

Bear markets - that's a 20 percent or greater decline in stocks - coming along frequently, but Jones warns that if we saw a 30 to 35 percent decline, which happens once a decade or so, the economic impact would be even greater today than in years past.

What's different now is the amount of money in stocks relative to the rest of the economy.

Central to his concerns is the Buffet Indicator, or the ratio you get when you divide the total value of all stocks by the complete value of the US economy.

It provides a clear indication of the market's valuation at any given moment - and today it's at an historic all-time high.

Jones discussed markets, his philosophy and the trajectory of his career in conversation with investing expert Patrick O'Shaughnessy on the Invest Like the Best podcast released today (but recorded back in February).

He warned that the Buffett Rule was flashing a huge warning about the overvaluation of stocks.

Today, the ratio of stocks to the economy is 230 percent, an all-time high.

Before the Black Monday stock market crash of 1929, the ratio was around 65 percent. Ahead of the massive crash in October 1987, it was around 90 percent. By the time of the dot-com crash in 2000, it was 170 percent.

If there were a 30 percent decline in the stock market - something that's not uncommon in historic stock market downdrafts - Jones said it would represent around 90 percent of one year of US economic output.

At the heart of his concerns is the 'reverse wealth effect,' which describes how falling asset prices - for things like real estate and stocks - make regular consumers feel poor and make them cut spending and buy less.

Consumer spending constitutes a 70 percent of the US economy, and it's the main driver of the nation's economic health.

Thanks to the relative overvaluation of stocks, Jones warns that even a modest occurrence of the 'reverse wealth effect' could have a giant impact on the economy.

This scenario could wreck more than just markets and the economy: Jones highlights that 10 percent of US tax revenues come from capital gains taxes, on the profitable sale of things like stocks.

Big declines in capital gains tax revenue that might accompany a market downturn could blow up the federal budget deficit, sink the bond market and drive a terrible negative feedback loop.

'And that's troubling - so, are we in a bubble? We're clearly in a sovereign debt bubble,' warned Tudor Jones.

During dot-com boom and bust, the federal government was able to raise interest rates without much impact.

But today, the US is weighed down by over $38 trillion in debt, severely restricting the ability to respond to any Wall Street collapse.

'Valuation matters a lot, and the stock market's really high and it's gonna be really hard to make money from here with any kind of long-term view,' said Jones.

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