You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Net reproductive rate of 1 can be achieved if Couple production rate is more than: and explain in detail?
Demographers are of the view that a net reproductive rate of 1 can be achieved if couple protection rate (CPR) is > 60%. CPR is based on observation that 50-60% of bihs in a year are of bih order 3 or more. Thus attaining a CPR of 60% or more will be equivalent to cutting off almost all third or higher order bihs leaving 2 or less children per couple or net reproductive rate around 1. Ref: Park 21st edition, page 456. Chapter: Demography and family planning.