The dollar has fallen 10% under Trump. It helps big multinational companies but is a ‘hidden tax’ raising costs from vacations to groceries

A hidden force is quietly pushing up costs for everything from your summer vacation to your weekly grocery bills: a weaker U.S. dollar.

The dollar has fallen about 10% against other major currencies since President Donald Trump returned to the White House, a pullback potentially playing a role in Americans’ concerns about affordability.

“It’s kind of a hidden tax,” says economist Thomas Savidge of the conservative-leaning American Institute for Economic Research. “What your...