and the population does not grow any further. Moreover,  when there is no resource limitation, that is K → ∞, this model reduces to the exponential growth model.  Figure 2b shows how a population  governed by the logistic equation grows in size. At the level of individual behavior, this model does not have the kind of justification that the exponential growth model does in the sense that the  logistic equation cannot be plausibly derived from the properties of individuals. In this sense it is a purely "phenomenological" model.