 COOL requirements discriminated against Canadian and Mexican livestock.The two countries asked the WTO to authorize US$3 billion in retaliatory tariffs against U.S. imports.In early December 2015, the WTO determined the impact of the COOL requirements on the Canadian and Mexican economies at $1.1 billion and authorized Canada and Mexico to impose $781 million and $228 million, respectively, in retaliatory tariffs against U.S. imports.