Abstract
Using general arguments we discuss corrections from unitarity and analyticity to the meson masses and mixing angles corresponding to the lowest q q states of the quark model. Although the input S wave q q states are nearly degenerate and the input couplings obey exact flavor symmetry and the Okubo-Zweig-Iizuka rule, the output unitarized masses and mixing angles are close to the observed ones. The much larger unitarity effects for the pseudoscalars compared to the vector mesons are accounted for by the spin-counting factor 3 for the P - PV - P and P - VV - P loops compared to the V - PP - V and the V - PV - V loops.
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