Sunk costs and fixed costs

[urvashi]

Are sunk costs different from the fixed costs ? And do we include sunk costs as costs in the short run for profit maximisation?

[Amit Goyal]

Let C(q) be the cost function

These are the definitions:

Sunk Cost = C(0)
Fixed Cost = lim_{q --> 0}  C(q)
Variable Cost = C(q) - Fixed Cost


Exercise:
Suppose C(q) = 5 + 2q if q >0; 3 if q = 0

Find Sunk Cost, Fixed Cost and Variable Cost.

[urvashi]

Sunk cost 3 ,fixed cost 5, and variable cost 2q thank you sir