 Thus, if the money incomes of the people rise while the price level in the economy stays the same, the size of the market will still not expand till the real income and productivity levels rise.To quote Nurkse,

Citing the limited size of the market as the main impediment in economic growth, Nurkse reasons that an increase in productivity can create a virtuous circle of growth.Thus, a large scale investment programme in a wide array of industries simultaneously is the answer.