Suppose the resources of a country increase and there is a simultaneous improvement in the production of one of the products. Illustrate and explain the nature of shift in the production possibility...

Suppose the resources of a country increase and there is a simultaneous improvement in the production of one of the products. Illustrate and explain the nature of shift in the production possibility frontier. ‘Demand’ is a word of common usage. What is the meaning of demand in economics? How is demand different from desire, want and need?