Production and Cost Theory

Opportunity cost is the value of the next best alternative forgone when making a choice. Production cost (A) refers to actual expenses. Physical cost (B) refers to tangible inputs. Real cost (D) is related to effort but not the forgone alternative concept. Opportunity cost captures the trade-off inherent in all economic decisions.

Option C is false because at the minimum point of the LRAC curve, the corresponding SRAC curve represents the least-cost plant size ONLY for that specific output level, not for all levels of output. Different output levels require different plant sizes. The LRAC curve is an envelope of SRAC curves, where each point is tangent to a different SRAC curve representing the optimal plant for that output.

The short-run average cost curve is called the plant curve because it shows the cost behavior for a given plant size with fixed capital. In the short run, at least one factor (usually capital/plant) is fixed, so the SRAC reflects costs for that specific plant. The long run curve allows plant size to vary.

In the long run, firms can freely enter or exit an industry. If price is below average total cost, the firm cannot cover all its costs and will eventually exit. Economic profit requires P >= ATC. Options B, C, and D are incorrect because P=MC is profit-maximizing condition (not exit condition), economies of scale reduce costs (encouraging entry), and P > LRAC would attract entry not exit.

Implicit costs are opportunity costs of using resources the firm already owns, where no explicit payment is made. Interest on retained earnings is forgone income from using the firm's own funds - a classic implicit cost. Options B, C, and D are explicit costs involving actual monetary payments to external parties.

Variable costs change with output level. Payroll taxes are levied as a percentage of wages paid to employees, so when employment (and thus output) changes, payroll taxes vary proportionally. Interest payments, franchise fees, and monthly rent are fixed - they don't automatically change with output in the short run.

Opportunity cost includes the value of the next best alternative use of resources. The Rs. 100 could have purchased other goods (value = Rs. 100), AND your time at the game has value that could have been used elsewhere. Both are sacrificed. The cost of dinner is part of the game experience, not an additional alternative cost. Finding the money doesn't eliminate opportunity cost - the money still has alternative uses.

Average fixed cost = Total Fixed Cost / Quantity. Since TFC is constant, AFC falls as output increases - the fixed cost is spread over more units. AFC is a rectangular hyperbola, approaching zero but never reaching it as output grows.

When average cost is at its minimum point, marginal cost equals average cost. This is the mathematical relationship: MC intersects AC from below at AC's minimum. Before the minimum, MC < AC (pulling average down). After the minimum, MC > AC (pulling average up). At the minimum itself, MC = AC.

Economic profit = Total Revenue - (Explicit Costs + Implicit Costs). Here: TR = Rs. 1,00,000, Explicit costs = Rs. 75,000, Implicit cost (owner's forgone salary) = Rs. 30,000. Total economic cost = 75,000 + 30,000 = Rs. 1,05,000. Economic profit = 1,00,000 - 1,05,000 = -Rs. 5,000 (a loss). The owner earns Rs. 25,000 accounting profit but less than their opportunity cost, so economic loss.

Option D is false because accounting profit = Total Revenue - EXPLICIT costs only, not implicit costs. Implicit costs are excluded from accounting calculations. Options A, B, and C are all true statements about economic costs, accounting costs, and the relationship between economic and accounting profit.

Opportunity cost refers to the value of the next best alternative forgone. The money spent on food during holiday is direct expenditure, not an opportunity cost. The money you COULD have earned by working (B) and money spent on theater tickets (A) represent trade-offs and opportunity costs.