Let S be the cube with vertices 
. Approximate 
by using a Riemann sum as in Definition 1, taking the patches 
to be the squares that are the faces of the cube and the points 
to be the centers of the squares.
Definitions:
Restraint of Trade
Legal phrase relating to practices or agreements that restrict competition or limit market entry.
Clayton Act
U.S. antitrust law aimed at increasing competition and preventing monopolies by prohibiting certain actions that lead to anti-competitiveness.
Price Discrimination
The practice of selling the same product or service at different prices to different customers, not due to differences in cost.
Competitors
Entities or individuals engaged in a commercial contest or rivalry, vying for the same market share or customer base.
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