Sum rules for inclusive reactions, which are the analogs of superconvergence relations for two-body reactions, are discussed. A local-saturation approximation to one of these sum rules yields ${(\frac{d\ensuremath{\sigma}}{\mathrm{dt}})}_{{\ensuremath{\pi}}^{+}p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\Delta}}^{++}}=\frac{3}{2}{(\frac{d\ensuremath{\sigma}}{\mathrm{dt}})}_{{\ensuremath{\pi}}^{\ensuremath{-}}p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}n}$, which is in good agreement with experiment.