Figure 2.

Optimal efforts of the operator ($e_{\mathrm{op}}^{\ast }$), mimic ($e_{\mathrm{mim}}^{\ast }$) and target ($e_{\mathrm{tar}}^{\ast }$) as a function of the fitness pay-off to the target (Δ_tar) for successful discrimination. For this graph, Δ_op = 2, Δ_mim = 3 and a = 0.01. The target's optimal effort steadily increases as its pay-off for successful discrimination increases, the operator's optimal effort steadily decreases as the target's pay-off for successful discrimination increases and the mimic's optimal effort increases and then decreases, as the target's pay-off for successful discrimination increases. (Online version in colour.)