President Donald Trump is set Wednesday to begin the biggest gamble of his nascent second term, wagering that broad-based tariffs on imports will jumpstart a new era for the U.S. economy.

The stakes couldn’t be higher.

As the president prepares his “liberation day” announcement, household sentiment is at multi-year lows. Consumers worry that the duties will spark another round of painful inflation, and investors are fretting that higher prices will mean lower profits and a tougher slog for the battered stock market.

What Trump is promising is a new economy not dependent on deficit spending, where Canada, Mexico, China and Europe no longer take advantage of the U.S. consumer’s desire for ever-cheaper products.

The big problem right now is no one outside the administration knows quite how those goals will be achieved, and what will be the price to pay.

“People always want everything to be done immediately and have to know exactly what’s going on,” said Joseph LaVorgna, who served as a senior economic advisor during Trump’s first term in office. “Negotiations themselves don’t work that way. Good things take time.”

For his part, LaVorgna, who is now chief economist at SMBC Nikko Securities, is optimistic Trump can pull it off, but understands why markets are rattled by the uncertainty of it all.

“This is a negotiation, and it needs to be judged in the fullness of time,” he said. “Eventually we’re going to get some details and some clarity, and to me, everything will fit together. But right now, we’re at that point where it’s just too soon to know exactly what the implementation is likely to look like.”

Here’s what we do know: The White House intends to implement “reciprocal” tariffs against its trading partners. In other words, the U.S. is going to match what other countries charge to import American goods into their countries. Most recently, a figure of 20% blanket tariffs has been bandied around, though LaVorgna said he expects the number to be around 10%, but something like 60% for China.

What is likely to emerge, though, will be far more nuanced as Trump seeks to reduce a record $131.4 billion U.S. trade deficit. Trump professes his ability to make deals, and the saber-rattling of draconian levies on other countries is all part of the strategy to get the best arrangement possible where more goods are manufactured domestically, boosting American jobs and providing a fairer landscape for trade.

The consequences, though, could be rough in the near term.

During his first term, Trump imposed heavy tariffs with nary a sign of longer-term inflation outside of isolated price increases. That’s how Federal Reserve economists generally view tariffs — a one-time “transitory” blip but rarely a generator of fundamental inflation.

This time, though, could be different as Trump attempts something on a scale not seen since the disastrous Smoot-Hawley tariffs in 1930 that kicked off a global trade war and would be the worst-case scenario of the president’s ambitions.

“This could be a major rewiring of the domestic economy and of the global economy, a la Thatcher, a la Reagan, where you get a more enabled private sector, streamlined government, a fair trading system,” Mohamed El-Erian, the Allianz chief economic advisor, said Tuesday on CNBC. “Alternatively, if we get tit-for-tat tariffs, we slip into stagflation, and that stagflation becomes well anchored, and that becomes problematic.”

The U.S. economy already is showing signs of a stagflationary impulse, perhaps not along the lines of the 1970s and early ’80s but nevertheless one where growth is slowing and inflation is proving stickier than expected.

Goldman Sachs has lowered its projection for economic growth this year to barely positive. The firm is citing the “the sharp recent deterioration in household and business confidence” and second-order impacts of tariffs as administration officials are willing to trade lower growth in the near term for their longer-term trade goals.

Federal Reserve officials last month indicated an expectation of 1.7% gross domestic product growth this year; using the same metric, Goldman projects GDP to rise at just a 1% rate.

In addition, Goldman raised its recession risk to 35% this year, though it sees growth holding positive in the most-likely scenario.

That view on business hesitation was backed up Tuesday in an Institute for Supply Management survey in which respondents cited the uncertain climate as an obstacle to growth.

“Customers are pausing on new orders as a result of uncertainty regarding tariffs,” said a manager in the transportation equipment industry. “There is no clear direction from the administration on how they will be implemented, so it’s harder to project how they will affect business.”

While Tilley thinks the concern over tariffs causing long-term inflation is misplaced — Smoot-Hawley, for instance, actually ended up being deflationary — he does see them as a danger to an already-fragile consumer and economy as they could tend to weaken activity further.

“We think of the tariffs as just being such a weight on growth. It would drive up prices in the initial couple [inflation] readings, but it would create so much economic weakness that they would end up being net deflationary,” he said. “They’re a tax hike, they’re contractionary, they’re going to weigh on the economy.”

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Annual Euro zone inflation dipped as expected to 2.2% in March, according to flash data from statistics agency Eurostat published Tuesday.

The Tuesday print sits just below the 2.3% final reading of February.

So called core-inflation, which excludes more volatile food, energy, alcohol and tobacco prices, edged lower to 2.4% in March from 2.6% in February. The closely watched services inflation print, which had long been sticky around the 4% mark, also fell to 3.4% in March from 3.7% in the preceding month.

Recent preliminary data had showed that March inflation came in lower than forecast in several major euro zone economies. Last month’s inflation hit 2.3% in Germany and fell to 2.2% in Spain, while staying unchanged at 0.9% in France.

The figures, which are harmonized across the euro area for comparability, boosted expectations for a further 25-basis-point interest rate cut from the European Central Bank during its upcoming meeting on April 17. Markets were pricing in an around 76% chance of such a reduction ahead of the release of the euro zone inflation data on Tuesday, according to LSEG data.

The European Union is set to be slapped with tariffs due in effect later this week from the U.S. administration of Donald Trump — including a 25% levy on imported cars.

While the exact impact of the tariffs and retaliatory measures remains uncertain, many economists have warned for months that their effect could be inflationary.

This is a breaking news story, please check back for updates.