loss of purchasing power over time, meaning your dollar will not go as far tomorrow as it did today. It is typically expressed as the annual change in prices for everyday goods and services such as food, furniture, apparel, transportation costs and toys.

Mr. McBride said the values of many stocks were being supported by extremely low yields on Treasury bonds, especially the 10-year yield, which has held to about 1.5 percent.

“If that yield moves up, investors are going to re-evaluate how much they’re willing to pay for per dollar of earnings for stocks,” he said. Even if corporate profits — which were strong in 2021 — continue to grow in 2022, he added, they are unlikely to expand “at a pace that continues to justify the current price of stocks.”

quicken the pace of pulling back on that aid, set to finish in March.

“The nightmare scenario is: The Fed tightens and it doesn’t help,” said Aaron Brown, a former risk manager of AQR Capital Management who now manages his own money and teaches math at New York University’s Courant Institute of Mathematical Sciences. Mr. Brown said that if the Fed could not orchestrate a “soft landing” for the economy, things could start to get ugly — fast.

And then, he said, the Fed may have to take “very aggressive action like a rate hike to 15 percent, or wage and price controls, like we tried in the ’70s.”

By an equal measure, the Fed’s moves, even if they are moderate, could also cause a sell-off in stocks, corporate bonds and other riskier assets, if investors panic when they realize that the free money that drove their risk-taking to ever greater extremes over the past several years is definitely going away.

Sal Arnuk, a partner and co-founder of Themis Trading, said he expected 2022 to begin with something like “a hiccup.”

“China and Taiwan, Russia and Ukraine — if something happens there or if the Fed surprises everyone with the speed of the taper, there’s going to be some selling,” Mr. Arnuk said. “It could even start in Bitcoin, but then people are going to start selling their Apple, their Google.”

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