Exponential growth-the J-shaped curve (指数增长模型，J型增长) Exponential growth formula(公式) ·Nt=Noet where r is the exponential growth parameter (自然增长率) No is the starting population ·t is the time elapsed r is the maximum rate of increase of the population内禀增长率 r=0 if the population is constant, r>0 if population is increasing, 6 r<0 if the population is decreasing 6 Exponential growth formula（公式）： • N t =N 0 ert • where r is the exponential growth parameter (自然增长率 ) • N 0 is the starting population • t is the time elapsed • r is the maximum rate of increase of the population 内禀增长率 • r=0 if the population is constant, r>0 if population is increasing, r<0 if the population is decreasing. Exponential growth – the J-shaped curve （指数增长模型， J型增长）