Core Concepts & Learning Goals
In business, "profit" seems like a simple concept: money in minus money out. In economics, however, the definition is more precise and powerful. The key distinction lies in how we measure costs. This topic explores the crucial difference between accounting profit, the number you see on a financial statement, and economic profit, the figure that truly drives business decisions.
Understanding this difference is essential because it explains why firms enter or exit industries. Firms are not just trying to make more money than they spend; they are trying to make more money than they could in their next-best alternative. By mastering this topic, you will be able to define and calculate different types of profit and explain how firms respond to profit opportunities based on a complete understanding of their costs.
Key Concepts Breakdown
1. The Two Types of Costs: Explicit and Implicit
To understand profit, we must first understand the two categories of costs that economists consider.
Explicit Costs are the direct, out-of-pocket payments a firm makes to others for resources. These are the costs an accountant would track on a ledger.
- Examples: Wages paid to employees, rent for office space, payments for raw materials, utility bills.
Implicit Costs are the opportunity costs of using resources the firm already owns. No money changes hands, but a cost is still incurred because that resource could have been used for something else.
- Examples: The salary an entrepreneur could have earned working for someone else, the interest a firm could have earned by investing its own funds instead of buying capital, the rent a firm could have earned by leasing out its own building.
2. Accounting Profit: The Bookkeeper's View
Accountants are primarily concerned with tracking the flow of money into and out of a firm. Therefore, they focus exclusively on explicit costs.
- Accounting Profit is defined as a firm's total revenue minus its total explicit costs. This is the profit figure typically reported in financial statements and for tax purposes.
The formula is straightforward:
[ \text{Accounting Profit} = \text{Total Revenue} - \text{Explicit Costs} ]
While useful, accounting profit provides an incomplete picture of a firm's performance because it ignores the opportunity costs of the firm's own resources.
3. Economic Profit: The Economist's View
Economists are interested in decision-making. A rational decision-maker must consider all costs, including opportunity costs. Therefore, economists use a broader measure of profit.
- Economic Profit is defined as a firm's total revenue minus its total costs, which includes both explicit and implicit costs. It measures how much better a firm is doing compared to its next-best alternative.
The formula for economic profit is:
[ \text{Economic Profit} = \text{Total Revenue} - (\text{Explicit Costs} + \text{Implicit Costs}) ]
An alternative way to think about this is to start with accounting profit and subtract the implicit costs:
[ \text{Economic Profit} = \text{Accounting Profit} - \text{Implicit Costs} ]
Because economic profit accounts for implicit costs, it will always be less than or equal to accounting profit.
4. Comparing Accounting and Economic Profit
The following table summarizes the key distinctions between the two measures of profit.
| Basis of Comparison | Accounting Profit | Economic Profit |
|---|---|---|
| Costs Considered | Only explicit, out-of-pocket costs. | Both explicit and implicit (opportunity) costs. |
| Core Question | Did the firm earn more revenue than it paid out? | Is the firm using its resources more profitably than the next-best alternative? |
| Primary Use | Financial reporting and tax calculation. | Analyzing firm behavior and decision-making (e.g., entry/exit). |
| Relative Value | Always greater than or equal to economic profit. | Always less than or equal to accounting profit. |
5. How Firms Respond to Economic Profit
The signal that drives a firm's long-term decisions is its economic profit, not its accounting profit. There are three possible outcomes for economic profit, each sending a different signal.
Positive Economic Profit (Profit > 0): This occurs when Total Revenue exceeds the sum of all explicit and implicit costs. It is a powerful signal that the firm is earning an above-average return—more than it could in its next-best alternative. This "supernormal" profit attracts new firms to enter the industry, seeking to capture similar returns.
Zero Economic Profit (Profit = 0): This is also known as Normal Profit. It occurs when Total Revenue is exactly equal to the sum of all explicit and implicit costs. This does not mean the firm is failing. On the contrary, it means the firm is earning just enough to cover all its costs, including compensating the entrepreneur for their time and the investors for the use of their capital. The firm is doing just as well as its next-best alternative. There is no incentive for firms to enter or exit the industry.
Negative Economic Profit (Economic Loss): This occurs when Total Revenue is less than the sum of all explicit and implicit costs. This is a signal that the firm's resources could be used more profitably in another industry. The firm is earning less than its next-best alternative. This economic loss will cause firms to exit the industry in the long run.
Crucially, a firm can have a positive accounting profit but a negative economic profit. In this scenario, an economist would predict the firm will eventually exit the business, as its resources are underperforming relative to their opportunity cost.
Step-by-Step Example
Let's calculate the different types of profit for a small consulting business run by its owner, Maria.
Scenario Data:
Total Annual Revenue: $150,000
Explicit Costs:
Office Rent: $24,000 per year
Employee Salary: $50,000 per year
Utilities & Supplies: $6,000 per year
Implicit Costs:
Maria's Forgone Salary: She could earn $75,000 per year as a manager at another company.
Forgone Interest: She used $20,000 of her personal savings to start the business. This money could have earned a 5% annual return in a safe investment.
Step 1: Calculate Total Explicit Costs
Sum all the direct, out-of-pocket payments.
Total Explicit Costs = Rent + Employee Salary + Utilities
Total Explicit Costs = $24,000 + $50,000 + $6,000 = $80,000
Step 2: Calculate Accounting Profit
Subtract total explicit costs from total revenue.
Accounting Profit = Total Revenue - Total Explicit Costs
Accounting Profit = $150,000 - $80,000 = $70,000
From an accountant's perspective, the business is profitable.
Step 3: Calculate Total Implicit Costs
Sum all the opportunity costs.
Forgone Interest = $20,000 * 5% = $1,000
Total Implicit Costs = Maria's Forgone Salary + Forgone Interest
Total Implicit Costs = $75,000 + $1,000 = $76,000
Step 4: Calculate Economic Profit
Subtract total implicit costs from the accounting profit.
Economic Profit = Accounting Profit - Total Implicit Costs
Economic Profit = $70,000 - $76,000 = -$6,000
The business is experiencing an economic loss of $6,000.
Step 5: Analyze the Result
Although Maria's business has an accounting profit of $70,000, it has an economic loss of $6,000. This means she is earning $6,000 less than she would by pursuing her next-best alternative (working as a manager and investing her savings). This economic loss signals that, in the long run, she would be financially better off closing her business and taking the other job.
AP Exam Tips & Common Pitfalls
[FRQ Task]: You will often be given a table or a short scenario with various revenue and cost figures. A common task is to "Calculate the accounting profit" and "Calculate the economic profit." You may then be asked, "Based on your calculation, will firms enter or exit this market in the long run? Explain." Your explanation must be tied directly to whether the economic profit is positive, negative, or zero.
[MCQ Task]: Multiple-choice questions frequently test your ability to distinguish between explicit and implicit costs. A question might describe a business owner who uses their own building and ask you to identify the forgone rent as an implicit cost.
[Common Pitfall ①]: Forgetting Implicit Costs. The most common mistake is to calculate profit using only the explicit costs provided. Always scan the problem for information about what the entrepreneur or the firm is giving up—a forgone salary, forgone rent, or forgone interest are the most common examples.
[Common Pitfall ②]: Misinterpreting Zero Economic Profit. Students often see "zero profit" and assume it is a bad outcome, signaling that a firm should shut down. This is incorrect. Zero economic profit is a normal profit. It means all costs, including opportunity costs, are being covered. It is the long-run equilibrium state in a competitive market and indicates the business is sustainable.
Key Vocabulary
Accounting Profit: Total revenue minus total explicit costs. This is the profit reported on financial statements.
Economic Profit: Total revenue minus total costs, where total costs include both explicit and implicit costs. This is the profit that drives firm decision-making.
Explicit Costs: A firm's direct, out-of-pocket payments for inputs to its production process.
Implicit Costs: The opportunity costs of using the resources that a firm already owns, such as an entrepreneur's forgone salary or interest.
Normal Profit: The condition where economic profit is zero. The firm is earning just enough revenue to cover its total costs, including compensating the owners for their time and capital.