Authored by Martin Feldstein, op-ed via The Wall Street Journal,

And unlike in the past, the Federal Reserve has little room to encourage growth by reducing rates…

Ten years after the Great Recession’s onset, another long, deep downturn may soon roil the U.S. economy. The high level of asset prices today mirrors the earlier trend in house prices that preceded the 2008 crash; both mispricings reflect long periods of very low real interest rates caused by Federal Reserve policy. Now that interest rates are rising, equity prices will fall, dragging down household wealth, consumer spending and economic activity.

During the five-year period before the last downturn, the Fed had decreased the federal-funds rate to as low as 1%. That drove down mortgage interest rates, causing home prices to rise faster than 10% a year. When the Fed raised rates after 2004, the housing-price bubble burst within two years.

As housing prices plummeted, homeowners with highly leveraged mortgages found themselves owing substantially more than their homes were worth. They defaulted in droves, causing lenders to foreclose on their properties. Sales of the foreclosed properties forced prices even lower, leading the national house-price index to decline 30% in three years.

Banks that held mortgages and mortgage-backed bonds saw their net worths decline sharply. A total of 140 U.S. banks failed in 2009, and those that survived were terrified by how much further the market might slide. To avoid risky bets, they shied away from lending to businesses and home buyers and refused to lend to other banks whose balance sheets were also declining.

The fall in home prices from 2006-09 cut household wealth by $6 trillion. Coinciding with a stock-market crash, the erased wealth caused consumer spending to drop sharply, pushing the economy into recession. The collapse of bank lending deepened the decline and slowed the recovery to a sluggish pace.

Fast forward to today.

Homes aren’t as overvalued as they were in 2006, so there’s little chance of an exact replay of the 2008 crisis. The principal risk now is that a stock-market slowdown could shrink consumer spending enough to push the economy into recession. Share prices are high today because long-term interest rates are extremely low. Today the interest rate on 10-year Treasury notes is less than 3%, meaning the inflation-adjusted yield on those bonds is close to zero. The hunt for higher yields drives investors toward equities—driving up share prices in the process.

But long-term rates are beginning to rise and are likely to increase substantially in the near future. Though the 3% yield on 10-year Treasurys is still low, it’s still twice as high as it was two years ago. It will be pushed higher as the Fed raises the short-term rate from today’s 2% to its projected 3.4% in 2020. Rising inflation will further increase the long-term interest rate as investors demand compensation for their loss of purchasing power. And as annual federal spending deficits explode over the coming decade, it will take ever-higher long-term interest rates to get bond buyers to absorb the debt. It wouldn’t be surprising to see the yield on 10-year Treasurys exceed 5%, with the resulting real yield rising from zero today to more than 2%.

As short- and long-term interest rates normalize, equity prices are also likely to return to historic price-to-earnings ratios. If the P/E ratio of the S&P 500 regresses to its historical average, 40% below today’s level, $10 trillion of household wealth would be wiped out. The past relationship between household wealth and consumer spending suggests such a decline would reduce annual spending by about $400 billion, shrinking gross domestic product by 2%. Add in the effects on business investment, and this spending crunch would push the economy into recession.

Most recessions are short and shallow, with an average of less than a year between the start of the downturn and the beginning of the recovery. That’s because the Fed usually responds to recessions by cutting the federal-funds rate substantially. But if one hits in the next few years, the Fed will not have enough room to cut rates, as the fed-funds rate is expected to rise to only 3% by 2020. There also won’t be much room for a major fiscal intervention. Federal deficits are expected to exceed $1 trillion annually in the coming years, and publicly held federal debt is predicted to rise from 75% of GDP to nearly 100% by the decade’s end.

This means a downturn brought on in the next few years by rising long-term interest rates would likely be deeper and longer than your average recession. Unfortunately, there’s nothing at this point that the Federal Reserve or any other government actor can do to prevent that from happening.

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