Group 1 - The U.S. government is beginning to implement the trade agreement reached with Japan in July, as evidenced by the reduction of tariffs on Japanese automobiles [2][5] - The tariff on Japanese cars will decrease from 27.5% to 15%, in addition to the existing 2.5% tariff, effective from September 16 [2][4] - A presidential order signed by President Trump on September 4 includes measures for reciprocal tariff reductions and eliminates tariffs on over 490 categories of aircraft parts [4][5] Group 2 - The reciprocal tariff reduction will unify the tax burden to 15%, retroactive to August 7, with excess tariffs to be refunded [4] - The aircraft parts previously subject to steel and aluminum tariffs will also see their tax burdens eliminated starting from September 16 [4]