Business objectives (OCR A-Level Economics): Revision Notes

3.3 Revenue and profit

DEFINITIONS:

1. Total revenue: The total amount of money a firm receives from selling its goods or services, calculated as the price per unit multiplied by the quantity sold.
2. Average revenue: The revenue a firm receives per unit of output sold, calculated by dividing total revenue by the quantity sold.
3. Marginal revenue: The additional revenue gained from selling one more unit of a good or service.
4. Profit/loss: The financial gain or loss a firm experiences, calculated as total revenue minus total costs.

Explain and calculate:

3.3.1 Total, average and marginal revenue

1. Total Revenue (TR):

• Formula: $\text{TR} = \text{Price} \times \text{Quantity}$

2. Average Revenue (AR):

• Formula: $\text{AR} = \frac{\text{TR}}{\text{Quantity}}$

• In a perfectly competitive market, AR equals the price of the good.

3. Marginal Revenue (MR):

• Formula: $\text{MR} = \frac{\Delta \text{TR}}{\Delta \text{Quantity}}$

• In a perfectly competitive market, MR equals AR. In imperfect competition, MR usually decreases as output increases due to the downward-sloping demand curve. These concepts are crucial for understanding how firms make pricing and output decisions and analyse their revenue performance.

3.3.2 Profit/loss

• It is calculated using the formula: $Profit=Total Revenue−Total Costs$

Profit can be categorised into normal profit and supernormal profit:

• Normal Profit: This is the minimum profit necessary to keep a firm in business, equal to the opportunity cost of using resources in a particular way. It occurs when total revenue equals total costs, including both explicit and implicit costs.
• Supernormal Profit: Also known as abnormal profit, this occurs when total revenue exceeds total costs, including normal profit. It represents extra earnings beyond what is required to stay in business and is a sign of economic efficiency or market power.
• Loss occurs when total costs exceed total revenue. It is calculated as: $Loss=Total Costs−Total Revenue$

A loss indicates that the firm is not covering all its costs, including both fixed and variable costs, and might need to reassess its operations or market strategies to return to profitability.

Understanding profit and loss helps in analysing a firm's economic performance and decision-making processes, including pricing, production, and market strategies.

Explain

3.3.3 Accounting, normal and supernormal profit

Accounting Profit: This is the total revenue minus the explicit costs of production. Explicit costs are the direct, out-of-pocket expenses a firm incurs, such as wages, rent, and materials. Accounting profit focuses solely on these observable costs and does not account for opportunity costs.

Normal Profit: This is the minimum profit required for a firm to remain in business in the long run. It occurs when total revenue equals the sum of explicit and implicit costs (i.e., opportunity costs). Normal profit is essentially the opportunity cost of the firm's resources and is considered the break-even point where the firm earns just enough to cover all its costs, including the cost of the entrepreneur's time and resources.

Supernormal Profit: Also known as economic profit, supernormal profit occurs when total revenue exceeds the sum of explicit and implicit costs. It represents profit above the normal profit level and indicates that a firm is earning more than just enough to cover its costs. Supernormal profit is a sign of financial success and can attract new firms into the market due to the potential for higher returns.