As Donald Trump emerged victorious in the presidential election Wednesday, stock prices soared.

As the stock market rose, the bond market fell.

Stocks roared to record highs Wednesday in the wake of news of Trump’s triumph, signaling an end to the uncertainty of the election cycle and, perhaps, a vote of confidence in his plans for the national economy, some economists said.

On the same day, the yield on 10-year Treasury bonds rose to 4.479%, a four-month high. A higher bond yield means a declining bond market: Bond prices fall as yields rise.

While stock traders rejoiced, bond traders voiced unease with Trump’s fiscal plans.

Trump campaigned on a promise to keep taxes low. He also proposed sweeping tariffs on imported goods.

Economists warn that Trump’s plans to preserve and extend tax cuts will widen the federal budget deficit, which stands at $1.8 trillion. Tariffs, meanwhile, could reignite inflation, which the Federal Reserve has battled to cool.

For bond investors, those worries translate to rising yields. The yield is the interest rate, the amount investors expect to receive in exchange for lending money: in this case, to the federal government.

In the current economic cycle, bond investors “might perceive there to be more risk of holding U.S. debt if there’s not an eye on a plan for reducing spending. Which there isn’t,” said Jonathan Lee, senior portfolio manager at U.S. Bank.

The 10-year Treasury bond is considered a benchmark in the bond market. The yield on those bonds “began to climb weeks ago, as investors anticipated a Trump win,” The New York Times reported, “and on Wednesday, the yield on 10-year Treasury notes jumped as much 0.2 percentage points, a huge move in that market.”

It was an ironic moment for bond yields to rise. Bond yields generally move in the same direction as other interest rates.

But the Federal Reserve cut interest rates on Thursday, trimming the benchmark federal funds rate by a quarter point. The cut was widely forecast and, in any case, the Fed’s interest rate decisions matter more for the short-term bond market.

Long-term bond yields are rising because “many investors expect that the federal government under Trump will maintain high deficit spending,” according to Bankrate, the personal finance site.

Many forecasters expect Trump and a Republican-led Congress to renew the 2017 Tax Cuts and Jobs Act, which trimmed tax rates across the board and fed the federal deficit during Trump’s first term.

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