3.4 - Types of Profit
Understanding profit in economics
Profit serves as a key signal in economics, guiding how firms allocate resources and make decisions. Rational economic agents, such as firm owners, compare marginal benefits and marginal costs to determine the optimal level of activity where total benefits exceed total costs. This comparison helps firms decide whether to enter, expand, or exit a market based on potential gains or losses.
Types of profit: Accounting vs. economic
Firms use different measures of profit to evaluate their performance, but not all types account for every cost involved in running a business. Understanding these distinctions is essential for analyzing how firms respond to market opportunities.
Accounting profit
Accounting profit is the simplest measure, calculated as the difference between a firm's total revenue and its explicit costs. Explicit costs are direct, out-of-pocket payments for resources, such as wages, rent, and materials. This type of profit appears on financial statements and focuses only on monetary expenses.
Formula for accounting profit:
Economic profit
Economic profit provides a more comprehensive view by subtracting both explicit and implicit costs from total revenue. Implicit costs represent the opportunity costs of using resources owned by the firm, such as the owner's time or invested capital that could earn returns elsewhere. Firms respond to economic profit rather than accounting profit when making long-term decisions, as it reflects the true profitability after all costs are considered.
Formula for economic profit:
Economic profit can be positive, zero, or negative, influencing whether a firm stays in the market.
The role of implicit and explicit costs
Costs are divided into explicit and implicit categories, which directly affect how profit is calculated and interpreted. Explicit costs are tangible payments made to outside parties, while implicit costs account for the value of resources the firm already owns but could use differently. This distinction explains why accounting profit often overstates true profitability.
Key types of costs:
- Explicit costs - These include payments for labor (wages), raw materials, utilities, and rent. They are recorded in accounting books as actual cash outflows.
- Implicit costs - These are non-cash opportunity costs, such as:
- The foregone interest on capital the owner invests in the business instead of elsewhere.
- Compensation for the risk the entrepreneur takes.
- The value of the owner's time, which could be spent on another job or venture.
Accounting profit ignores implicit costs, but including them in economic profit gives a fuller picture of whether the business is truly worthwhile.
The meaning of normal profit
Normal profit occurs when economic profit is zero, meaning total revenue exactly covers both explicit and implicit costs. In this case, the firm earns just enough to compensate for all resources used, including the opportunity costs. Normal profit is considered the minimum level needed to keep a firm in the market long-term, as it fully rewards the entrepreneur without excess gains or losses.
This leads to a situation where the firm has no incentive to leave the market but also no extra profit to attract new entrants. If implicit costs are fully compensated, the result is normal profit, signaling efficient resource use without economic loss.
How firms respond to profit opportunities and losses
Firms make decisions based on economic profit or loss, which acts as a signal for resource allocation. Positive economic profit indicates that the firm is earning more than its total costs, including opportunities foregone. This attracts new firms to the market, increasing competition and potentially driving profits back to normal levels.
Responses to different profit scenarios:
- Positive economic profit - Firms expand production or new entrants join the market to capture the opportunity, as resources are being used more profitably than alternatives.
- Zero economic profit (normal profit) - Firms continue operating at the current level, as they are covering all costs without excess gains or losses.
- Negative economic profit (economic loss) - Firms may reduce output, exit the market, or reallocate resources elsewhere, as the business is not covering implicit costs and could be more profitable in another use.
These responses help markets adjust toward efficiency, where resources flow to their most valued uses based on marginal benefit-cost comparisons.
Calculating a firm's profit or loss
To determine a firm's profit or loss, use the economic profit formula, incorporating both explicit and implicit costs. This calculation helps identify whether the firm should continue, expand, or shut down.
Formula for economic profit:
Positive values indicate profit, zero shows normal profit, and negative means loss.
Worked example - Calculating economic profit
A small bakery has total revenue of $150,000 in a year. Explicit costs are $90,000 (including wages, ingredients, and rent). Implicit costs include $40,000 for the owner's foregone salary and $10,000 in opportunity cost for invested capital. Calculate the economic profit and interpret the result.
Step 1: Identify the values
- Total revenue = $150,000
- Explicit costs = $90,000
- Implicit costs = $40,000 + $10,000 = $50,000
Step 2: Apply the formula
Step 3: Interpretation
The positive economic profit of $10,000 means the bakery is earning more than its total costs, including opportunities foregone, signaling an opportunity for expansion or attracting competitors.