["\nThis article analyzes the everyday interpretive practices of corporations and bureaucrats that shape the meaning and force of international economic law. To understand how common practices such as public consultation submissions, corporate threat letters, and external legal assistance influence regulators' understanding of their “legally available” policy space, we study the contested introduction of a pioneering nutrition labeling regulation in Chile. The transnational food industry powerfully challenged the regulation's legality under World Trade Organization law. But Chilean health bureaucrats, in coordination with segments of the country's legally highly competent economic bureaucracy, effectively defended the legality of their proposed regulatory measure. Drawing on data from freedom‐of‐information requests and in‐depth interviews, the article argues that the outcomes of such interpretive contests are substantially shaped by participants' knowledge of the entitlements created by international economic law and thus by the international legal expertise they have access to. This often but not always puts transnational corporations at an advantage over national regulators in the strategic interpretation of international economic law.\n", "Law & Society Review, Volume 54, Issue 3, Page 571-606, September 2020. "]