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CISCEISC (Commerce) Class 12
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Syllabus

Producer's Equilibrium in Short Period and Long Period

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Topics

  • Short period vs long period
  • Short-period equilibrium of the firm
  • Long-period equilibrium with entry and exit
  • Monopoly in short and long period
  • Real-Life Application
  • Key Points: Producer's Equilibrium in Short Period and Long Period
CISCE: Class 12

Short period vs long period

Short period

  • Time period in which the number of firms in the industry is fixed.
  • New firms cannot enter the industry and existing firms cannot leave.
  • Some factors are fixed; firms can only adjust output with given plant size.

Long period

  • Time period long enough for firms to enter or exit the industry.
  • The number of firms is variable.
  • All factors are variable; firms can adjust plant size and scale of production.
CISCE: Class 12

Short-period equilibrium of the firm

In the short period, firms cannot enter or leave the industry. The firm is still in equilibrium where MC = MR, and MC cuts MR from below, but the profit position can differ.

(A) Super-normal (abnormal) profit in short period

  • Condition at equilibrium:
    TR > TC or AR > AC
  • Because no new firm can enter in the short period, existing firms keep earning supernormal profit.
  • There is no extra competition to push down price or profit.

(B) Loss in short period

  • Condition at equilibrium:
    TR < TC or AR < AC
  • Even if the firm is making a loss, it cannot leave the industry in the short period.
  • The firm may continue if it can at least cover its variable cost and reduce loss.

(C) Normal profit in short period

  • Condition:
    TR = TC or AR = AC
  • At this point, the firm is just covering all costs, including normal profit of the entrepreneur.
  • It still satisfies MC = MR.

Thus, in the short period, a firm in equilibrium can have super-normal profit, normal profit, or loss, depending on the position of AR and AC at the output where MC = MR.

CISCE: Class 12

Long-period equilibrium with entry and exit

In the long period, under perfect competition and monopolistic competition, firms can freely enter and exit the industry.

(A) Super-normal profit and entry of new firms

  1. Suppose existing firms are earning super-normal profit:
    TR > TC or AR > AC
  2. High profit attracts new firms into the industry.
  3. Entry of new firms increases industry supply.
  4. Increased supply reduces the market price (and hence AR and MR of each firm).
  5. This process continues until super-normal profit disappears and only normal profit remains.

(B) Loss and exit of firms

  1. Suppose existing firms are making losses:
    TR < TC or AR < AC.
  2. In the long period, some firms leave the industry.
  3. Exit reduces industry supply.
  4. Reduced supply raises the market price (AR and MR of each firm).
  5. This process continues until losses disappear and firms earn normal profit.

Long-run result under perfect and monopolistic competition

  • With free entry and exit, long-run equilibrium is such that each firm earns only normal profit:
    TR = TC or AR = AC.
  • At this level, no firm has an incentive to enter (no extra profit) or to exit (no loss).
CISCE: Class 12

Monopoly in short and long period

Under monopoly, there is no freedom of entry for new firms.

  • In the short period, a monopolist may earn super-normal profit, normal profit, or even loss, depending on demand and cost at the output where MC = MR.
  • In the long period, because new firms cannot enter, any super-normal profit can continue as long as demand is strong and costs permit.
  • Therefore, a monopolist can earn super-normal profit even in the long run, unlike firms in competitive markets.
CISCE: Class 12

Real-Life Application

  • Competitive-type market (entry and exit):
    Think of many small coaching centres in a city. If some centres earn very high profit, more coaching centres open. Increased competition forces fees down, and extra profit gets squeezed. If centres incur losses for long, some will close, reducing supply and pushing fees up.
  • Monopoly-type situation (no entry):
    A single railway company or a government-controlled utility has no competitors. If it can charge a price above cost, it may continue to earn high profit because no new firm can enter to undercut its price.
CISCE: Class 12

Key Points: Producer’s Equilibrium in Short Period and Long Period

  • Producer’s equilibrium is where profit is maximised and usually occurs at MC = MR with MC cutting MR from below.
  • In the short period, firms cannot enter or exit, so equilibrium can involve super-normal profit, normal profit, or loss.
  • In the long period, with free entry and exit (perfect and monopolistic competition), firms earn only normal profit .
  • Under monopoly, absence of entry allows the monopolist to earn super-normal profit even in the long run.
  • Long-run equilibrium under perfect competition occurs where MC = MR = AR = AC, so the firm makes only normal profit at the price set by the industry.

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