In the always inventive world of exchange-traded funds, you can find funds focused on European carbon credits, social media, and even one that aims to profit from the obesity of Americans.

“There’s a lot of wacky stuff out there — I can’t keep track of them all,” said Daniel Sotiroff, an analyst with Morningstar Research Services. “People are drawn to the new, bright shiny objects.”

So, of course, there are E.T.F.s aimed at investing in America’s trade and tariff tiffs with China, India, Europe and whatever other nation or region the Trump administration may be confronting.

For the last several months, trade fights have played out in the market. During May, the broad S&P 500-stock index tumbled more than 4 percent as United States-China trade tensions rose, after the index reached a new high during April. By the end of June, the index jumped on a reported thaw in bilateral trade relations, with stocks in some sectors — such as technology and gambling — having one-day pops of as much as 6 percent.