Which of the following acts prohibits discriminatory pricing between different purchasers?

The Robinson-Patman Act is the legislation that specifically addresses discriminatory pricing practices between different purchasers. Enacted in 1936 as an amendment to the Clayton Act, it aims to protect small businesses from unfair pricing practices by ensuring that sellers must offer the same price to competing buyers for goods of like grade and quality. This means that if one buyer is charged a lower price for a product than another buyer, these practices could be seen as discriminatory and therefore violate the act, unless the price difference can be justified by differing costs of manufacture or other legitimate business reasons.

Understanding this context is crucial, as it helps delineate the roles of various antitrust laws. For example, the Sherman Act primarily deals with broader antitrust issues, such as restricting trade and commerce through monopolistic practices. The Clayton Act addresses other forms of anti-competitive behavior, but it is the Robinson-Patman Act that specifically targets price discrimination. The Federal Trade Commission Act focuses on preventing unfair competition and deceptive practices but does not specifically address pricing disparities among purchasers. Thus, the Robinson-Patman Act stands out as the correct choice for prohibiting discriminatory pricing practices.