---
title: "Zero Profit Condition | Principles of Economics"
description: "Zero profit condition is the long-run point where a perfectly competitive firm earns no economic profit because price equals minimum average cost."
canonical: "https://fiveable.me/principles-econ/key-terms/profit-condition"
type: "key-term"
subject: "Principles of Economics"
unit: "Unit 8"
---

# Zero Profit Condition | Principles of Economics

## Definition

The zero profit condition is the long-run outcome in perfect competition where firms earn zero economic profit, meaning total revenue covers all economic costs, including opportunity cost.

## What It Is

The zero profit condition is the long-run result in Principles of Economics when a perfectly competitive firm earns exactly enough to cover all of its economic costs, but no more. That means revenue equals total cost, including the opportunity cost of the owner’s time, money, and resources.

“Zero profit” does not mean the business is failing or making nothing at all. It means economic profit is zero. A firm can still have accounting profit on paper and still be at zero economic profit if it is only covering the full cost of using its resources.

This condition shows up in perfectly competitive markets because firms can freely enter and leave. If firms in the market are earning positive economic profit, new firms are attracted in. Their entry increases supply, which pushes market price down. As price falls, each firm’s profit shrinks.

If firms are taking losses, the process works the other way. Some firms exit the market, supply falls, and price rises until the surviving firms stop losing money. The market settles where price is just high enough for firms to cover their costs and stay in the industry.

At that point, price equals the minimum point on the firm’s long-run average cost curve. That is why the zero profit condition is tied to long-run equilibrium in perfect competition. Firms are not earning excess returns, and there is no further reason for entry or exit.

A quick way to picture it is a coffee shop market with lots of identical shops. If one neighborhood shop is making strong profits, more coffee shops open nearby. Competition increases, customers spread out, and price pressure drives profits back down. In the long run, the market lands at zero economic profit, even though the shops may still be busy and covering their bills.

## Why It Matters

The zero profit condition is the cleanest way to show how perfectly competitive markets settle over time. It connects the ideas of economic profit, entry and exit, and long-run equilibrium into one process instead of treating them like separate facts.

It also helps you read market stories correctly. A business that is “making profit” in the everyday sense may not be making economic profit. If revenues only cover explicit costs plus opportunity cost, the firm is earning zero economic profit and has no long-run incentive to expand just because of profits.

This concept is also useful for comparing market structures. In perfect competition, free entry and exit push profits toward zero. In contrast, if a market has barriers to entry, firms may keep earning economic profit for longer because new competitors cannot move in easily.

The zero profit condition also explains why resources flow toward the lowest-cost producers in the long run. Firms that cannot cover their full economic costs leave, while efficient firms stay. That sorting process is part of why perfect competition is often linked to efficient resource allocation.

## Connections

### Perfect Competition

The zero profit condition is a long-run feature of perfect competition. Because firms are price takers and entry is free, any economic profit attracts new firms and any loss drives firms out. That constant movement pushes the market toward the point where price equals long-run average cost.

### Economic Profit

You need economic profit to understand zero profit condition. Economic profit subtracts opportunity cost, not just explicit expenses, so a firm can have accounting profit and still have zero economic profit. The zero profit condition means that extra return above the full cost of using resources has disappeared in the long run.

### Long-Run Equilibrium

Zero profit condition is one of the signs that a competitive market has reached long-run equilibrium. At that point, firms have no incentive to enter or exit, and price has adjusted to the minimum of average total cost. If profits or losses appear, the market is no longer in that equilibrium.

### [Long-Run Supply Curve](/principles-econ/key-terms/long-run-supply-curve)

The zero profit condition helps explain why the long-run supply curve in perfect competition is shaped the way it is. As firms enter and exit, the market supply adjusts until firms earn zero economic profit. In a constant-cost industry, that process can keep long-run price near the same level even as output changes.

## On the AP Exam

A problem set or quiz question will usually ask you to show what happens to a perfectly competitive firm after a change in profit. You may need to draw the market and firm graphs, then explain why entry or exit continues until economic profit is zero. The move to make is simple: check whether price is above or below long-run average cost. If price is above it, entry happens; if price is below it, exit happens.

You may also be asked to interpret a scenario, like a market with lots of new firms opening after a profitable year. The correct explanation is that the market is moving toward the zero profit condition. On graph-based questions, look for price at the minimum point of the long-run average cost curve and explain that firms are earning normal return only, not economic profit.

## Zero Profit Condition vs Accounting Profit

Accounting profit and zero profit condition are not the same. Accounting profit is revenue minus explicit costs, while zero profit condition in economics means economic profit is zero after all opportunity costs are counted. A firm can look profitable on a financial statement and still be at the zero profit condition in economic terms.

## Key Takeaways

- The zero profit condition means a firm is earning zero economic profit, not necessarily zero sales or zero accounting profit.
- It happens in the long run in perfectly competitive markets because free entry and exit force profits and losses to disappear.
- When economic profit is positive, new firms enter and push price down; when firms are losing money, some exit and push price up.
- At the zero profit condition, price equals the minimum of the firm's long-run average cost curve.
- This condition is a major sign that the market has reached long-run equilibrium.

## FAQs

### What is zero profit condition in Principles of Economics?

It is the long-run situation in perfect competition where a firm earns zero economic profit. Revenue covers explicit costs and opportunity cost, so there is no extra return left over. This is the point where firms have no reason to enter or exit the market.

### Does zero profit condition mean a firm is shutting down?

No. It means the firm is covering all of its economic costs, so it is doing just enough to stay in the market. A firm can still be operating normally and making accounting profit while economic profit is zero.

### How do entry and exit lead to zero profit condition?

If firms are making positive economic profit, new firms enter and raise supply, which lowers price and profits. If firms are losing money, some exit, supply falls, and price rises. That process continues until firms end up at zero economic profit.

### What does zero profit condition look like on a graph?

On a competitive firm graph, price ends up equal to the minimum point of long-run average cost. That is why the firm earns zero economic profit in the long run. If price is above that point, entry is still happening; if it is below, exit is still happening.

## Related Study Guides

- [8.3 Entry and Exit Decisions in the Long Run](/principles-econ/unit-8/3-entry-exit-decisions-long-run/study-guide/HttcUF9HMsNtYyJl)

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