WordNet records no synonym and no antonym for fair-trade agreement. It is the only member of its synset, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
an agreement (illegal in the United States) between the manufacturer of a trademarked item of merchandise and its retail distributors to sell the item at a price at or above the price set by the manufacturer
Synonyms, antonyms and the broader and narrower relations for fair-trade agreement come from Princeton University’s WordNet. Full sources and licences.