LONDON — A few weeks before Britons voted on whether to remain part of the European Union, Michael Gove, one of the leaders of the Leave campaign, was asked why he should be trusted over the overwhelming number of economists and international authorities who opposed Brexit. “People in this country have had enough of experts,” he replied.

Experts are, of course, known to make mistakes. But in this case, the people who voted for Brexit will pay a big price for ignoring economic expertise. The harmful effects of this vote are both immediate and lasting.

Britons are already worse off. The pound has — so far — plunged by nearly 9 percent against the dollar, slashing the value of British assets, with higher import prices likely to follow. The stock market has also taken a hit. The prices of property, most British people’s main asset, are almost certain to fall, too. While Mark Carney, the governor of the Bank of England, has already pledged 250 billion pounds (about $345 billion) to support the financial system and has said he could offer more if necessary, central bankers cannot protect against an enduring economic shock.

Rarely have businesses faced such uncertainty. Britain’s economy had already slowed as they put investment decisions on hold ahead of the referendum. Now, a country renowned for its political and legal stability is descending into chaos. The future prime minister is unknown, as is the direction his or her policies will take. The favorite to replace David Cameron, Boris Johnson, the former mayor of London who opportunistically campaigned for Brexit, styles himself as pro-market and pro-globalization, but in the lead-up to the vote he said he supports curbs on European Union migration, tariffs on Chinese steel and higher public spending. The future terms on which Britain will trade with both the European Union and all the countries with which it has negotiated trade deals on Britain’s behalf are uncertain. Domestic regulations on everything from finance to environmental protection may change.