6.3 Test your Knowledge ( Question ) : Q : Refer the video lecture , once an economist Malthus has predicted that production of food will slow down because of diminishing marginal product of labour , without increasing capital . So , continuous increase in demand due to increase in world population , some day may result in mass starvation . Now world population has increased more than 800 % and there is no mass starvation as predicted . Discuss what did Malthus get wrong ?