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In their recent "Mach's principle and higher-dimensional dynamics", Mashhoonand Wesson argue that Mach's principle is not properly incorporated intogeneral relativity and that in Einstein's theory "the origin of inertia remainsessentially the same as in Newtonian physics." While it is true that the motionof a single test particle in a Newtonian inertial frame of reference appearsessentially the same as in an Einsteinian local inertial frame, this misses thepoint. The issue is not what motion looks like in an inertial frame ofreference but what is the origin of the inertial frame. Unlike Newtoniandynamics, general relativity does implement Mach's principle when consideredfrom this correctly formulated point of view.

Mach's principle: A response to Mashhoon and Wesson's paper (DOI 10.1002/andp.201100100)