Investors on three continents dumped stocks on Monday, fretting that the governments of the world’s two largest economies — China and the United States — would act in ways that could undercut the nascent global economic recovery.

The Chinese government’s reluctance to step in and save a highly indebted property developer just days before a big interest payment is due signaled to investors that Beijing might break with its longstanding policy of bailing out its homegrown stars.

And in the United States, the globe’s No. 1 economy, investors worried that the Federal Reserve would soon begin cutting back its huge purchases of government bonds, which had helped drive stocks to a series of record highs since the coronavirus pandemic…