Question:
It was observed in Chapter 12 that collusion among oligopolists can be facilitated in part by information sharing. As a consequence, the sharing of price information among rival oligopolists can violate U.S. antitrust laws. You can see how the U.S. Supreme Court has interpreted antitrust law as it pertains to sharing information by reading a summary of the case of U.S. vs U.S. Gypsum Co. et al. (483 U.S. 422), which is available at: https://supreme.justia.com/us/438/422/case.html
In what manner was price information shared, and why did the court find these actions to be an antitrust violation?