Abstract
It is noted that if two mesons are allowed by the quark model to resonate, they do so for ${p}^{*}\ensuremath{\le}{p}_{0}^{\mathrm{MM}}\ensuremath{\equiv}350$ MeV/c, where ${p}^{*}$ is the c.m. momentum. The corresponding value for mesonbaryon systems is ${p}_{0}^{\mathrm{MB}}\ensuremath{\equiv}250$ MeV/c, suggesting (in an optical picture) that the baryon is indeed bigger than the meson. Crucial tests of the rule are provided by exotic baryon-antibaryon systems, for which one expects ${p}_{0}^{\mathrm{BB}}\ensuremath{\cong}200$ MeV/c, and by other specific two-body modes which are predicted to resonate not far above threshold.
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