NEW YORK — U.S. stocks whipped through another dizzying day Wednesday in the final hours before President Donald Trump’s unveiling of the tariffs promised as part of his ” Liberation Day,” which could drastically remake the global economy.

The S&P 500 rose 0.7%, but only after careening between an earlier loss of 1.1% and a later gain of 1.1%. It’s had a pattern this week of opening with sharp drops only to finish the day higher.

The Dow Jones Industrial Average added 235 points, or 0.6%, and the Nasdaq composite climbed 0.9%. Both also veered from sharply lower in the morning to sharply higher in the afternoon before doubling back.

Elon Musk’s Tesla helped knock the market around after initially falling more than 6% following a report that it delivered fewer electric vehicles in the first three months of the year than it did in last year’s first quarter.

Tesla is one of Wall Street’s most influential stocks because of its immense size, and it’s faced backlash due to anger about CEO Elon Musk’s leading the U.S. government’s efforts to cut spending. But its stock erased its loss from the morning and ended with a gain of 5.3% following a report from Politico that Trump has told others that Musk will step back from his government role in coming weeks.

Financial markets around the world have broadly been shaky lately because of uncertainty about Trump’s trade war. He has said he wants tariffs to make the global system more fair and to bring manufacturing jobs back to the United States from other countries. But tariffs also threaten to grind down growth for the U.S. and other economies, while worsening inflation when it may be stuck above the Federal Reserve’s 2% target.

One of the hopes that’s helped push upward on the U.S. stock market recently is the possibility that at least the worst of the uncertainty around tariffs may be passing.

“We do not know how long the previously enacted tariffs and any future tariffs will remain in force, but we believe peak tariff uncertainty may soon be behind us,” according to Kurt Reiman, head of fixed income Americas, and other strategists at UBS Global Wealth Management. “Much of the work the administration set out to achieve will have been put in place, and there are numerous potential offramps available.”

Before Liberation Day, Trump had already announced 25% tariffs on auto imports; levies against China, Canada and Mexico; and expanded tariffs on steel and aluminum. Trump has also put tariffs against countries that import oil from Venezuela and plans separate import taxes on pharmaceutical drugs, lumber, copper and computer chips.

But even if Trump’s tariffs ultimately end up being less harsh than feared, a worry hitting the market is that their herky-jerky rollout may by itself create enough nervousness to get U.S. households and businesses to freeze their spending, which would damage the economy.

Surveys have shown deepening pessimism, but economists are waiting to see if that translates into actual damage for the economy. A report on Wednesday suggested the U.S. job market may still be running stronger than expected.