Question 1 Introduction
Marginal cost is the cost of producing one extra unit of output or service.
A direct cost is a cost that cannot be identified directly with each unit of output.
Wages paid to non-production staff (such as managers, secretaries, accountants) are a direct cost.
A cost that does not normally change when the level of output increases is known as a fixed cost.
Factory rent is normally a fixed cost but, if an increase in production requires a second factory to be rented, the cost behaviour is called a semi-variable cost.
Marginal cost is the cost of producing one extra unit of output or service.