In many recent antitrust cases, manufacturers of complex high- technology equipment have been accused of exercising market power in the sale of proprietary service or parts necessary to maintain the machines they produce. The manufacturer generally concedes that it has market power in selling...

Many businesses provide aftermarket services, including parts, maintenance, consulting, upgrades and modifications to durable consumer and business equipment. We investigate the effect on the original equipment manufacturer and on consumers if the manufacturer is the only (monopoly) service...