After five years of uncertainty and turmoil, the U.S. economy is ending 2024 in arguably its most stable condition since the start of the coronavirus pandemic.

Inflation has cooled. Unemployment is low. The Federal Reserve is cutting interest rates. The recession that many forecasters once warned was inevitable hasn’t materialized.

Yet the economic outlook for 2025 is as murky as ever, for one major reason: President-elect Donald J. Trump.

On the campaign trail and in the weeks since his election, Mr. Trump has proposed sweeping policy changes that could have profound — and complicated — implications for the economy.

He has proposed imposing steep new tariffs and deporting potentially millions of undocumented immigrants, which could lead to higher prices, slower growth or both, according to most economic models. At the same time, he has promised policies like tax cuts for individuals and businesses that could lead to faster economic growth but also bigger deficits.

And he has pledged to slash regulations, which could lift corporate profits and, possibly, overall productivity. But critics warn that such changes could increase worker injuries, cause environmental damage and make the financial system more prone to crises over the long run.