Costs, Revenues, Profits, and Objectives (Edexcel A-Level Economics A): Revision Notes

Revenues, Profits, and Objectives

Understanding revenue

Revenue is the money that a firm receives from selling its goods or services. There are three main ways to measure revenue, each providing different insights into a firm's financial performance.

Types of revenue

Total revenue (TR) represents the complete amount of money a firm receives from all its sales. This is calculated by multiplying the price of the product by the number of units sold.

Average revenue (AR) shows the typical amount received per unit sold. When there are no indirect taxes, this equals the price that customers pay. The demand curve actually represents the average revenue because it shows the price at different quantities.

Marginal revenue (MR) measures the extra money a firm gains when it sells one more unit of output. This helps firms understand how their revenue changes as they adjust their production levels.

Revenue formulas

The mathematical relationships between these concepts are straightforward:

$\text{Total Revenue (TR)} = \text{Price} \times \text{Quantity Sold}$

$\text{Average Revenue (AR)} = \frac{\text{Total Revenue}}{\text{Quantity Sold}}$

$\text{Marginal Revenue (MR)} = \frac{\Delta \text{Revenue}}{\Delta \text{Quantity Sold}}$

These formulas work similarly to the relationships between total, average, and marginal costs that you studied earlier.

The relationship between sales and revenue

Understanding how quantity sold affects revenue is crucial for business decision-making. When a firm faces a downward-sloping demand curve, increasing sales requires lowering prices, which creates an interesting relationship between average and marginal revenue.

When the MR line crosses the horizontal axis (where $\text{MR} = 0$), this marks the point where total revenue reaches its maximum. Beyond this point, marginal revenue becomes negative, meaning that selling additional units actually reduces total revenue.

Why does MR fall faster than AR?

To sell more units, a firm with market power must lower its price. However, this lower price applies not just to the extra units sold but potentially to all units.

Business objectives

Firms organise production by bringing together factors of production to create output. But this raises an important question: what motivates them to produce particular quantities of output at specific prices? Economic analysis examines several possible objectives that firms might pursue.

Profit maximisation

Traditional economic theory assumes that firms aim to maximise profits. But what exactly counts as "profit" in this context?

Normal profit is the minimum profit level needed to keep a firm operating in its market. It represents the opportunity cost of the firm's resources – essentially, what the owners could earn by using their capital elsewhere. Economists consider normal profit as part of the firm's total costs because it's necessary to keep the business running.

Supernormal profit (also called abnormal profit or economic profit) is any profit earned above the normal profit level. These higher profits indicate that a firm is performing better than the minimum required to stay in business.

The MR = MC rule for profit maximisation

Firms maximise profit by producing at the output level where marginal revenue equals marginal cost ($\text{MR} = \text{MC}$). This is one of the most important principles in economics.

The logic behind this rule is straightforward. If marginal revenue exceeds marginal cost, the firm gains more from selling an extra unit than it costs to produce it, so profit increases by expanding output. Conversely, if marginal cost exceeds marginal revenue, producing an additional unit costs more than it brings in, so the firm would increase profits by reducing output. Only when $\text{MR} = \text{MC}$ has the firm found the optimal output level that maximises profit.

Profit maximisation with different demand curves

When a firm faces a downward-sloping demand curve (as most firms do), the analysis becomes slightly more complex.

Total revenue now follows a curved path rather than a straight line. It rises initially as quantity increases, reaches a peak, and then falls. Profit is maximised at the output level where the vertical distance between the total revenue and total cost curves is greatest.

The shut-down point in the short run

Sometimes a firm may continue operating even when it's not covering all its costs. In the short run, a firm that isn't covering its opportunity costs might still remain in the market, provided it covers its variable costs.

The shut-down point is the price level below which a firm will stop production in the short run. This occurs where price falls below average variable cost. At this point, the firm's revenues no longer cover even its variable costs.

In the long run, however, the firm must make at least normal profit to survive. If long-run average costs exceed average revenues, the firm will eventually exit the market.

Alternative business objectives

Not all firms aim purely to maximise profits. Research has shown that managers may pursue other objectives, leading to different output and pricing decisions.

Revenue maximisation

Economist William Baumol argued that managers might focus on maximising revenue rather than profit. This creates different outcomes compared to profit maximisation.

A revenue-maximising firm produces more output than a profit-maximising one. To sell this extra output, it charges a lower price. The revenue maximisation point occurs where $\text{MR} = 0$, which is at the peak of the total revenue curve.

Sales maximisation

In some situations, managers prioritise sales volume over revenue or profit. This could lead to even higher output levels than revenue maximisation.

A sales-maximising firm pushes output to the point where total revenue just covers total cost, including normal profit. At this point, average cost equals average revenue. The firm breaks even but has maximised the volume of sales.

The extent to which managers can pursue sales maximisation depends on their accountability to shareholders. Managers typically have better information about market conditions and internal operations than shareholders do, which may allow them some discretion to pursue their own objectives.

Long-run profit maximisation

Sometimes firms take a strategic long-term view rather than maximising short-run profits. Several scenarios might justify this approach:

• Investment for future growth: A firm might undertake costly investment now to achieve higher profits in the long term
• Building customer loyalty: Firms may delay price increases following cost rises to maintain customer satisfaction
• Strategic positioning: Actions that reduce short-run profits might strengthen the firm's competitive position over time

Behavioural theories of the firm

Businesses don't always pursue traditional objectives like profit or revenue maximisation. This might happen consciously through deliberate management decisions, or as a result of principal-agent problems where managers' motivations differ from owners' interests.

Satisficing behaviour

Satisficing describes behaviour where managers aim to produce satisfactory results rather than maximum profits. Herbert Simon introduced this concept, suggesting that managers might prefer a comfortable working environment over the stress of pushing for absolute maximum profits.

Firms might take rational approaches to decisions but lack complete market information or the analytical capacity to use available information fully. When information is costly to acquire or analyse, firms make the best decisions they can with what they have. This situation is known as bounded rationality – the firm's ability to make fully rational decisions is limited by information constraints.

Corporate social responsibility

Many firms now emphasise their commitment to ethical business practices. Corporate social responsibility (CSR) involves actions demonstrating commitment to behaving in the public interest. This might include:

• Promoting community programmes and charitable activities
• Improving employee welfare and working conditions
• Engaging in environmental protection and sustainability initiatives
• Encouraging employee volunteering activities

Has CSR become essential for firms' survival? If customers perceive that failing to engage with CSR significantly impacts a firm's sales, then commitment to social responsibility becomes crucial for competing with rivals. In this case, CSR expenditure becomes part of a firm's strategy to protect its market position, and these costs become necessary operating expenses for maintaining the market share needed to maximise long-run profits.

Why assume profit maximisation?

Given the various objectives firms might pursue, should economists abandon the profit maximisation assumption?

From a modelling perspective, assuming profit maximisation offers significant advantages. It provides a simple, clear assumption that enables straightforward analysis of firm behaviour. This creates a useful benchmark for understanding how firms operate, even if it doesn't perfectly describe all real-world behaviour.

Some apparently non-profit-maximising strategies might actually represent long-run profit maximisation. For example, if all firms in a market engage in CSR to improve credibility with customers, then CSR expenditure becomes part of operating costs and a necessary element of maintaining the market share required to maximise long-term profits.

Case study: Coke vs Pepsi in India

In the mid-2000s, Coca-Cola and PepsiCo competed intensely to increase sales in India. A pesticide contamination scare in previous years had caused sales to plummet, and both firms sought recovery.

The companies adopted several strategies:

• Reducing bottle sizes to appeal to lower-income consumers
• Cutting prices to increase affordability
• Expanding distribution in rural areas
• Encouraging more at-home consumption in urban areas

India offered substantial growth potential, showing one of the world's lowest average consumption levels of fizzy drinks, significantly below the Asian average. This partly reflected concerns about children consuming colas at school.

However, the firms charged some of the world's lowest prices for cola, battling to increase market share. This led to reduced profit margins and continued competition from local producers. The logistics of supplying such a large and diverse region added significantly to costs. To counter this, companies reduced bottle weight and used cheaper transport methods like bullock carts and cycle rickshaws in rural areas.

Market analysts suggested that soft-drink companies should be able to improve profits, but executives remained focused on boosting sales volumes. A Coca-Cola marketing executive in India stated that "any affordability strategy will put pressure on margins, but it is critical to build the market".

This case illustrates how firms may prioritise market share and sales volume over immediate profit maximisation, whilst also demonstrating the growing importance of corporate social responsibility in business strategy.