Tomatoes have become a widely cited symbol of the U.S. affordability squeeze as prices climb faster than other grocery items. Multiple outlets report that tomato prices increase about 40% over the past year, which is the largest rise among products tracked in the Consumer Price Index. Separate reporting also cites an April year-over-year overall inflation reading of 3.8%, the highest in nearly three years.

While the cause is presented as a mix of factors, one explanation centers on trade and policy changes affecting supply. Reporting says the U.S. withdrew from a deal that allowed duty-free tomato imports from Mexico, delaying the impact until later in winter and early spring. When the tomatoes arrived under the new terms, they were subject to a tariff of about 17%. Economists and business experts also attribute price pressures to a “perfect storm” that includes extreme weather and the broader effects of the Iran war, such as higher gas prices and shipping costs.

The higher prices are reported to affect both consumers and businesses that rely on tomatoes, including restaurants and sandwich chains, which say ingredient costs have risen substantially.