Summary

Portrait of William O. Douglas William O. Douglas United States v. Grinnell Corporation…

But there is here a single use, i.e., the protection of property, through a central station that receives signals. It is that service, accredited, that is unique and that competes with all the other forms of property protection. We see no barrier to combining in a single market a number of different products or services where that combination reflects commercial realities. To repeat, there is here a single basic service-the protection of property through use of a central service station-that must be compared with all other forms of property protection.
Source: Wikisource

Portrait of William O. Douglas William O. Douglas United States v. Grinnell Corporation…

There are also protective services connected directly to a municipal police or fire department. But most cities with an accredited central station do not permit direct, connected service for private businesses. These alternate services and devices differ, we are told, in utility, efficiency, reliability, responsiveness, and continuity, and the record sustains that position. And, as noted, insurance companies generally allow a greater reduction in premiums for accredited central station service than for other types of protection.
Source: Wikisource

Portrait of William O. Douglas William O. Douglas United States v. Grinnell Corporation…

Defendants earnestly urge that despite these differences, they face competition from these other modes of protection. They seem to us seriously to overstate the degree of competition, but we recognize that (as the District Court found) they 'do not have unfettered power to control the price of their services * * * due to the fringe competition of other alarm or watchmen services.' 236 F.Supp., at 254. What defendants overlook is that the high degree of differentiation between central station protection and the other forms means that for many customers, only central station protection will do.
Source: Wikisource

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