At Monday's debate with Hillary Clinton, Donald Trump declared the need to renegotiate trade deals because U.S. trading partners are "taking our jobs." Through trade pacts and institutions like the World Trade Organization, the United States has sought to rip down barriers to global commerce, including quotas and taxes on imports. [...] critics charged that China didn't play by the rules — unfairly subsidizing exporters, manipulating its currency to give them a competitive edge and condoning the theft of U.S.