But much as in Japan two decades ago, an aging population and falling productivity have sapped the capacity of the American economy to sustain its previous pace. According to the Congressional Budget Office, the economy’s growth potential has fallen by half from its postwar average to less than 2 percent now. With the domestic economy already growing a bit above that pace, injecting more easy money into the engine won’t make it run much faster, particularly not after 10 years of trying.

At the same time, liberals like Bernie Sanders and Alexandria Ocasio-Cortez are turning to unconventional easy money theories as a way to pay for ambitious social programs. But they might want to take a closer look at who has benefited most after a decade of easy money: the wealthy, monopolies, corporate debtors. Not exactly liberal causes.

By fueling a record bull run in the financial markets, easy money is increasing inequality, since the wealthy own the bulk of stocks and bonds. Research also shows that very low interest rates have helped large corporations increase their dominance across United States industries, squeezing out small companies and start-ups. Once seen as a threat only in Japan, zombie firms — which don’t earn enough profit to cover their interest payments — have been rising in the United States, where they account for one in six publicly traded companies.

All these creatures of easy credit erode the economy’s long-term growth potential by undermining productivity, and raise the risk of a global recession emanating from debt-soaked financial and housing markets. A 2015 study of 17 major economies showed that before World War II, about one in four recessions followed a collapse in stock or home prices (or both). Since the war, that number has jumped to roughly two out of three, including the economic meltdowns in Japan after 1990, Asia after 1998 and the world after 2008.

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Recessions tend to be longer and deeper when the preceding boom was fueled by borrowing, because after the boom goes bust, flattened debtors struggle for years to dig out from under their loans. And lately, easy money has been enabling debt binges all over the world, particularly in corporate sectors.

As the Fed prepares to announce a decision this week, growing bipartisan support for a rate cut is fraught with irony. Slashing rates to avoid deflation made sense in the crisis atmosphere of 2008, and cutting again may seem like a logical response to weakening global growth now. But with the price of borrowing already so low, more easy money will raise a more serious threat.

By further lifting stock and bond prices and encouraging people to take on more debt, lowering rates could set the stage for the kind of debt-fueled market collapse that has preceded the economic downturns of recent decades. Our economy is hooked on easy money — and it is a dangerous addiction.

Ruchir Sharma, author of “The Rise and Fall of Nations: Forces of Change in the Post-Crisis World,” is the chief global strategist at Morgan Stanley Investment Management and a contributing opinion writer.

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