What is the difference between marginal cost and marginal revenue

The marginal cost is the cost that is added by producing one additional unit of a product or service. This is, in fact, a change in the total cost that is generated by the production of an additional product or service.

Marginal revenue is the revenue generated by the production of an additional product or service. It can be presented as additional revenue by increasing the sales of a product or service by one unit.

social contract theory basically says that all individuals are born equal, and provided a god given right to consent to be governed. american government is based of this

thomas hobbes and john locke said that we are selfish, individualistic, and constantly at war with each other, therefore we need to be controlled. 

government is defined as the legitimate use of force to control human behavior within territorial boundaries, here comes in hobbes and locke.

hobbes takes the part about controlling human behavior. while locke takes the part of legitimate use of force, since force is not legitimate unless there is consent of the people. 

there are basically 3 goals of the government: 1) maintain order by protecting life and property. 2) providing public goods, those which are typically not provided by the public sector, such as roads and education. 3) promote equality be it political, opportunist or outcome equality. 

it was on the rise and doing very well and would continue to do well until the great depression from 1929-1939