The influence of sales on revenue
Microeconomic Decision‑Makers: Firms’ Costs, Revenue and Objectives
The Influence of Sales on Revenue
Imagine a band that sells tickets for a concert. The more tickets they sell, the more money they earn. In economics, sales (or quantity sold) and price together determine a firm’s total revenue (TR). The basic relationship is:
TR = P × Q (Price times Quantity)
📈 When price stays constant: If the firm can sell more units, revenue rises proportionally. 💡 When price falls: The firm may sell more units, but each unit brings in less money. The net effect on revenue depends on how much the price falls relative to the increase in quantity sold.
Revenue Curves: A Visual Guide
| Price (P) | Quantity Sold (Q) | Total Revenue (TR) |
|---|---|---|
| $10 | 100 | $1,000 |
| $8 | 150 | $1,200 |
| $6 | 200 | $1,200 |
| $4 | 250 | $1,000 |
Notice how revenue increases as price falls from $10 to $8, peaks at $1,200, and then falls again when the price drops further. This illustrates the concept of price elasticity of demand and its impact on revenue.
Key Take‑aways for the Exam
- Remember the formula: TR = P × Q.
- Understand that revenue can rise or fall when price changes, depending on how demand responds.
- Use the revenue curve to explain why a firm might lower its price to increase total revenue.
- Be ready to calculate TR for given price and quantity values.
Exam Tip: When asked about the effect of a price change on revenue, sketch a simple revenue curve or use a table to show the relationship clearly. Highlight the point where revenue is maximised and explain why it occurs.
Analogy: The “Ticket Sales” Example
Think of a firm as a concert organizer. If the ticket price is high, fewer people buy tickets, but each ticket brings in a lot of money. If the price is low, more people buy tickets, but each ticket brings in less money. The total money the organizer earns depends on balancing these two effects. 🎤🎟️
Quick Check: If a firm sells 300 units at $5 each, what is its total revenue?
Answer: $5 × 300 = $1,500. ??
Revision
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