The Agreement on Government Procurement of the World Trade Organization (WTO), commonly known as the GPA, establishes a framework of rights and obligations for government procurement among the WTO members that have signed it. The signatories have agreed that suppliers of goods and services in other signatory countries will be treated no less favorably than domestic suppliers in procurement covered by the Agreement, and that their laws, regulations and procedures relating to government procurement will be transparent and fair.
https://www.trade.gov/wto-agreements?anchor=content-node-t7-field-lp-region-2-1
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