For producer prices, the relative increases associated with tariffs are due solely to the rising input cost channel, the study showed.

But the study did not explicitly consider the effects of increased uncertainty about future trade policy. Many economists see the trade uncertainty as a primary driver in the decline in business investment this year.

Despite resilient consumer spending and a strong labor market, U.S. business investment has declined for two straight quarters -- dropping by 1 percent in the second quarter and 2.3 percent in the third quarter.

Meanwhile, U.S. manufacturing sector contracted for a fourth consecutive month in November partly due to tariffs and trade policy uncertainty, according to the Institute for Supply Management.

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