Increasing return to scale means as production goes on increasing cost per unit of production will go on decreasing.This is due to updation of tecnology,capital intensive and automation method and optimum utilisation of resources.

Tertiary sectors are non-manufacturing unit but service producing sector. Like transport, banking, insurance, publicity and advertisement. They provide assistance to manufacturing sectors.

MP curve is downward sloping.

1.Scarcity of resources and 2.allocation of available resources in a proper manner.

Many of the natural resources are exhaustible when it will run out it will create problems in future because of its scarcity. When Natural resources like coal, petroleum ,diesel and other fossil fuels are used it causes air pollution,water pollution which give rise to many problems.

PPC concave shows That MRT is increasing. 

When demand for one product is effected by change in price  of another prouduct. It is called Cross Demand

Copy mean replica of the original and the original is kept/preserved. But move means something new is made by amending the original and the the original is not kept/preserved.

Production possibility curve or production possibility frontier is concave to the origin because for producing  two kinds of goods,if one item is  increased the other item will have to be reduced because land is a fixed factor.that is ppc is concave to the origin. 

The  following are the non-economic goals of the firm.

1) production of quality goods/services at cheaper price.

2) creation of employment at a larger scale.

3) social service towards the community.

4) welfare of their people under their employment.

5) adherence to the monopolies and restrictive trade practices act,1969 .

6) not to do unfair trade practices and indulge others not to do the same strictly.