A wide range of economists agree with the president — but only in part. They generally accept his argument that in the long run, the bill and his infrastructure plan could make businesses and their workers more productive, which would help to ease inflation as more goods and services are produced across the economy.

But many researchers, including a forecasting firm that Mr. Biden often cites to support the economic benefits of his proposals, say the bill is structured in a way that could add to inflation next year, before prices have had time to cool off.

Some economists and lawmakers worry about the timing, arguing that the risk of fueling more inflation when it has reached record highs outweighs the potential benefits of passing a big spending bill that could help to keep prices in check while addressing other social goals. Prices have picked up by 6.2 percent over the past year, the fastest pace in 31 years and far above the Federal Reserve’s inflation target.

Others say that any near-term effect on prices would be small and easy enough for the Fed to offset later with interest rate increases, which can temper demand and cool a hot economy.