'The Goalposts of the Tariffs Keep Moving'

"Over the last couple weeks, the most common question I've gotten behind the counter at the store is 'how are tariffs going to affect bookstores?' It's a question I've had some difficulty answering--partially because I don't know in the face of the umpteenth unprecedented financial event in my lifetime, and partially because the goalposts of the tariffs keep moving. (Since I started writing this e-mail on Monday night, there have been at least two major changes and announcements about the tariffs.)"