Net economic benefit as a function of α , for different values of r
. Each point is the mean of 20 simulation runs with error bars showing ±1 standard deviation. Parameters: p = 0.25, q = 0.5, c = 0.05, and r
takes the values 1, 2 (=), and 3 in (a) and 2 (=), 10 and ∞ in (b). Note the change of vertical scale between (a) and (b). r
= ∞ is modelled by making the awareness neighbourhood sufficiently large to include the whole population.