This model represents the population of Durham Region, Ontario (the eastern GTA, including Oshawa, Whitby, Ajax, Pickering, and Clarington), using the same density-dependent logistic structure as a wildlife population model. Unlike a closed animal population, most of Durham's growth comes from net migration rather than biological births and deaths, so "growth rate" here means the region's overall per-capita population growth (natural increase + net migration combined), not literal fertility/mortality rates. Growth is fastest while the region is well below its land-use/infrastructure capacity and tapers toward a low background rate as the region approaches build-out. A delay is included because housing supply and infrastructure only respond to population pressure after a lag; rezoning and construction take years, not months.
