Meaning and Concepts of Cost

Every act of production uses up scarce resources, and the value of the resources used up in producing a good or service is called its cost of production. Economists, however, look at cost more broadly than an accountant does, because a firm's true cost includes not only what it actually pays out in money, but also the value of resources it owns and uses without any direct cash payment.

Explicit cost is the actual money expenditure a firm makes to outsiders for the resources it hires or buys — wages paid to hired workers, payments for raw materials, rent paid for a leased building, interest paid on borrowed capital, and electricity or transport bills. These are the costs that appear as entries in the firm's account books, because a real payment changes hands.

Implicit cost (also called imputed cost) is the estimated value of the resources the firm's own owner supplies to the business without receiving any direct payment for them — the entrepreneur's own capital invested in the business, a building she owns and uses herself instead of renting out, or her own labour and time devoted to running the firm. No cash actually leaves the firm for these, so they never appear in ordinary accounting records, but they are genuine costs in the economic sense: the owner could have earned something by putting these very resources to their next best alternative use instead (renting out the building, lending out the capital at interest, or working for someone else for a salary), and that forgone earning is exactly what implicit cost measures.

Total economic cost of production is the sum of the two: $\text{Total Cost} = \text{Explicit Cost} + \text{Implicit Cost}$. Ignoring implicit cost (as ordinary accounting profit does) can make a business look profitable even when it is not truly covering the value of everything the owner has put into it.

Two further, related distinctions matter for understanding cost fully:

Private cost vs. Social cost. Private cost is the cost actually borne by the firm itself for its own production — its explicit cost plus its implicit cost. Social cost is wider: it is the private cost PLUS any cost that the firm's production imposes on third parties or on society at large, for which the firm pays nothing — for instance, a factory's air or water pollution that forces the surrounding community or the local government to spend money on healthcare or water purification. Whenever such an uncompensated external cost exists, social cost exceeds private cost, and the firm's own accounts understate the true cost of what it produces.

Money cost vs. Real cost. Money cost is the total sum of money a firm spends to acquire the factors of production it uses. Real cost, an older idea associated with Alfred Marshall, refers instead to the actual exertion, sacrifice and disutility that the suppliers of factors of production undergo in providing their services — the tiredness of a worker's labour, or the abstinence a saver practises by not spending her income immediately. Real cost is a subjective, non-monetary notion and cannot be measured directly in rupees, which is why modern economic analysis works mainly with money cost, while real cost remains useful for understanding WHY factor owners must be paid at all.

Underlying explicit and implicit cost alike is the idea of opportunity cost — the value of the next best alternative that is given up when a resource is used in one particular way rather than another. When a firm uses its own capital or premises in production instead of renting them out, the cost it bears is precisely the opportunity cost of that resource — this is exactly why implicit cost is often described as the opportunity cost of self-owned resources used in production.

This state's syllabus treats these cost concepts in the same way as the core principles of cost analysis taught across Indian economics curricula, since they describe universal features of how any producer's true cost is measured.