Politicians may debate whether big-government socialism or free-market capitalism leads to better economic outcomes. Their constituents may worry about rising prices and declining prospects for retirement. But neither group has the power to create money with no questions asked, manipulate the cost of capital, or counteract movements in financial markets. The central bankers are in charge—and perhaps that should change.

Even if duly elected leaders try to make good on campaign promises, they face hurdles if monetary authorities, domestic and global, disagree. What happened in Britain is a cautionary tale for nations that have relinquished to central banks the keys to economic performance. British Prime Minister Liz Truss, together with her finance minister, Kwasi Kwarteng, last month announced plans to spur investment and economic expansion by cutting taxes for individuals and businesses. Days later, they were verbally lashed by Mark Carney, a former governor of the Bank of England, for “working at some cross-purposes” with the nation’s central bank.