Though tariffs may be politically appealing to Washington, the expert warned, they may trigger retaliatory cycles. "Modern economies thrive on interdependence. Disrupting this balance risks inflation, ...

See? “By” originally means “bye” or byway. That’s why, in fact, some people still spell “by the by” as “by the bye”. By the way, “that is by the by or bye” in this sense (secondary) is an idiom that ...