The wide range and uneven application of import tariffs by President Donald Trump is causing unease among consumers and businesses.

President Donald Trump said he will announce his most sweeping economic measure yet Thursday, reciprocal tariffs that Trump argues would level the playing field for the U.S. in global trade and would instantly become the hallmark economic policy of his nascent second term, though economists project they would increase inflation this year.

Reciprocal tariffs refer to tariffs—the taxes charged on imported goods—the U.S. government plans to levy against global trading partners that are equal to the existing tariffs foreign countries have set against American goods. “Very simply, it’s if they charge us, we charge them,” the President said on Sunday during a flight on Air Force One.