Gov. Gretchen Whitmer said Michigan parents starting back-to-school shopping should expect to pay more for backpacks and shoes as a result of President Donald Trump’s tariffs.

Many companies shipped more goods and raw materials into the U.S. before tariffs hit. Economists and analysts reckon that hoarding has helped some delay hiking prices until later in the year and explains why tariffs have not yet shown up in U.S. inflation data.