Figure 3 also shows several possible values for the harvesting rate, H. At formula_19, there are two possible population equilibrium points: a low population size (formula_20) and a high one (formula_21). At formula_22, a slightly higher harvest rate, however there is only one equilibrium point (at formula_18), which is the population size that produces the maximum growth rate. With logistic growth, this point, called the maximum sustainable yield, is where the population size is half the carrying capacity (or formula_24). The maximum sustainable yield is the largest yield that can be taken from a population at equilibrium.