Which of the following is legal according to the Robinson-Patman Act of 1936? Marketing Chapter 3 Which of the following is legal according to the Robinson-Patman Act of 1936? A. Whistle-blowing. B. Exclusive dealerships. C. Reciprocity. D. Quantity discounts. E. Tie-in sales. Answer: D. Quantity discounts. Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+