  Hence, or so Bondi’s argument goes, since there is reason not to trust the laws of physics if the universe is evolving, let us presume that the universe is not evolving and changing; that is, let us presume PCP. Although the principle (and the theory which results from it—steady state cosmology) is, as McVittie remarked, “much more restrictive than general relativity”; (McVittie 1990, p. 45) it is this very restrictiveness which satisfies Bondi’s Popperian wishes: 