PPC curve shows alternative production possibilities of two goods with given technique and given resources. Movement along PPC curve shows either increase or decrease in resources or either inferior or superior use of technology or growth of both resources
For ex. Earlier we use technology by which we need 40 units of capital and 10 units of Labour to produce 50 units of capital goods and now with new technology with 40 units of capital and 5 units of Labour we produced 60 units of capital goods