For catalytic systems with high γ B-A (>1.0, blue), the surface product B* lowers in energy faster than A*, resulting in a decreasing transition state energy and activation energy by the linear scaling relationship; for this reason, high gamma systems exhibit an increasing turnover frequency with increased binding energy of B* consistent with a sharp volcano peak depicted in Figure . In contrast, the low γ B-A catalytic systems (γ <1.0, red) exhibit three regimes. At low binding energy (< -0.4 eV), the surface is bare, and the overall rate is controlled by the rate of adsorption; at moderate binding energies (-0.4 eV < BE B < 0.2 eV), the rate is controlled by desorption. Even higher binding energies lead to surface reaction control. The common point of all curves (0.2 eV relative binding energy of B*) is equal to the linear scaling parameter, δ ~ 1.4 eV (offset relative to a binding energy of B of 1.0 eV).