Malthus argued in An Essay on the Principle of Population that due to the desire to breed, the population will continue to grow and exceed resource levels until the world is faced with famine, disease, etc. In Ecology and the Crisis of Overpopulation, Shah pointed out the flaws in Malthus's argument. Just because the population grows does not mean resources will run out or it will continue to increase the population. Technology has allowed rapid food production. While Shah does not rule out Mathus's outcome completely, he does state that technology is still in progress.