All of the following elements must be present for a pricing practice to be considered discriminatory under the Robinson-Patman Act EXCEPT:
a. The seller must charge different prices to different customers for the same product.
b. The seller must make two or more actual sales within a reasonably short time.
c. The transaction must occur in interstate commerce.
d. The products sold must not be commodities.
e. There must be significant competitive injury.
ANSWER: d