The more Quantity increases the more Quality improves. Explain ?

Higher the Demand, Higher the supply and higher the supply there should be higher quantity of production. The increase of quantity(as the customer demand according to time and situation) add advancement plus technology in production which obviously improve quality. Thats how more quantity increase the more quality improves.

Increasing national productivity can raise living standards because more real income ... In production there are two features which explain increasing economic well-being. They are improving quality-price-ratio of commodities and increasing ... of different quality and quantity are combined into products of different quality