The Optimum Theory of population has following limitations:
- The optimum theory is based on economic consideration only. It has not taken political consideration. There is no wonder that some countries are encouraging population increase basically due to political reason.
- The optimum population is an imaginary concept because, less population cannot be increased nor can more population be reduced instantly.
- It is difficult to achieve the optimum population.
- The optimum population is not a rigid one. It is flexible. The level of optimum population increases with increase in resource and technology. Likewise, it decreases with decrease in resources and technology.