Final answer:
The Robinson-Patman Act addresses promotional allowances and aims to protect small businesses from unfair competition by preventing price discrimination.
Step-by-step explanation:
The act that specifically addresses promotional allowances is the Robinson-Patman Act. This act, passed in 1936, strengthens the provisions of the Clayton Antitrust Act by prohibiting price discrimination that could reduce competition.
This means companies are not allowed to offer special discounts or allowances to some consumers while denying them to others. The goal of the act is to protect small businesses against unfair competition from larger businesses that could offer such discriminatory discounts.