The Trade Desk Inc (NASDAQ:TTD) shares hit a new 52-week low Tuesday as investors fled high-multiple growth names after President Donald Trump threatened a 10% tariff on all goods entering the U.S. from Denmark, Norway, Sweden, France, Germany, the U.K., the Netherlands and Finland starting Feb. 1. Here’s what investors need to know.Trade Desk stock is testing key support levels. What’s behind TTD weakness?European Tariffs Put Pressure On Trade Desk's Advertiser BaseThe Trade Desk is a pure-play demand-side ...