Preview
Contribution
IB DP Business Management — Unit 3: Finance and Accounts | HL | 3.3 Contribution (HL)
📋 What You Will Learn
- Define contribution per unit and total contribution, and state their formulae
- Calculate contribution per unit, total contribution, and profit using contribution-based analysis
- Apply contribution to make-or-buy decisions and special-order pricing decisions
- Analyse how contribution thinking differs from full-cost (absorption) pricing
- Evaluate the usefulness and limitations of contribution analysis for business decision-making
- Link contribution analysis to the four concepts — particularly change, ethics, and sustainability
📊 Topic Importance
| Paper | Relevance | Common Question Types |
|---|---|---|
| Paper 1 | High | Calculate contribution for the pre-seen company; recommend a make-or-buy or special-order decision |
| Paper 2 | High | Section B: calculate contribution, total contribution, profit from stimulus data; Section C: evaluate contribution-based decisions linked to a concept |
| Paper 3 (HL) | High | Use contribution to justify a pricing or production recommendation for a social enterprise |
🔍 Guiding Question When a business is deciding whether to accept a low-price order, drop a product line, or outsource production, how can it determine whether that decision actually makes it better or worse off financially?
🌍 Why This Matters In 2023, Ryanair accepted bookings at fares below £10 on routes where its planes would otherwise fly half-empty. Critics called it "selling below cost." Ryanair's finance team knew better: as long as each passenger's fare covered the variable cost of carrying them, every extra seat sold was contributing to the fixed costs of the flight — costs that existed whether the seat was filled or not.
What Is Contribution? The Core Idea
Every unit a business sells must first pay for the resources directly consumed in making it — the variable costs. Whatever is left over after that does not disappear: it flows toward paying the firm's fixed costs, and once those are covered, it becomes profit. That "leftover" amount is called contribution.
📘 Contribution per unit The selling price of one unit minus the variable cost of producing that unit. It represents the amount each unit sold contributes first toward covering fixed costs and, once fixed costs are fully covered, toward profit.
💡 Analogy: The Bucket and the Tap Imagine fixed costs as a bucket that must be filled before any profit flows out. Each unit sold pours in an amount equal to its contribution. Selling price pays for the variable cost of the water (the unit itself) before any reaches the bucket. Only once the bucket overflows does profit appear.
Contribution per unit
\[ \text{Contribution per unit} = P -