CMA Final · Entrepreneurship and Startup

Scalability, Scaling up and Stabilisation of Sustainable Business: formula sheet

Full chapter guide

Key formulas

Scalability test (idea): Scalable if revenue growth rate > cost growth rate as volume rises; This is a rule of thumb for judging a model, not a fixed statutory formula.
Contribution per unit: Contribution per unit = Selling price per unit − Variable cost per unit; A high and stable contribution per unit supports scalability.
Operating margin: Operating margin = Operating profit ÷ Revenue × 100; If this margin rises as revenue rises, the model is showing scale benefits.
Growth rate: Growth rate (%) = (Current value − Previous value) ÷ Previous value × 100; Use it for revenue and for cost, then compare the two rates.
Unit contribution: Contribution per unit = Selling price per unit − Variable cost per unit; Check this is positive before scaling. Scaling a negative-contribution model increases losses.
Break-even units: Break-even units = Fixed costs ÷ Contribution per unit; Useful to test whether a new market, product or franchise outlet is viable.
Growth rate: Revenue growth % = (Current revenue − Previous revenue) ÷ Previous revenue × 100; Used to show the pace of scaling. Compare it with the growth in costs.
Customer acquisition payback (LTV to CAC): LTV ÷ CAC, where LTV = lifetime gross margin from a customer and CAC = cost to acquire a customer; Many investors look for LTV comfortably above CAC. The exact ratio they want varies, so do not quote one as a rule.
Franchisor income from one outlet: Royalty = Royalty rate × Franchisee sales; Add any upfront franchise fee to get the franchisor's total earnings.
Burn rate: Monthly burn rate = Cash spent in the month − Cash received in the month; Net burn. Gross burn is total monthly cash spending only. State which one you use.
Cash runway: Runway (months) = Cash in hand ÷ Monthly net burn rate; Shows how long the business survives before new funding is needed.
Unit economics check: Contribution per customer = Revenue per customer − Variable cost to serve; LTV ÷ CAC should be well above 1; LTV is lifetime value, CAC is customer acquisition cost. A commonly used benchmark is about 3, but it is a rule of thumb, not a fixed law.
Scaling test: Scaling = Revenue growth rate > Cost growth rate; If cost grows as fast as revenue, the business is growing, not scaling.
Four challenge groups: Operational | Financial | People | Market; Use this as the answer structure for any question on challenges.
Funding gap: Funding gap = Total funds required − Funds available internally; Total funds include capex, working capital and the operating losses during the growth period.
Cash runway (months): Runway = Cash in hand ÷ Monthly net cash burn; Net burn = cash outflow − cash inflow. Aim to raise the next round well before runway ends.
Post-money valuation: Post-money = Pre-money + New investment; Investor's stake = Investment ÷ Post-money.
Founder stake after a round: New stake = Old stake × (1 − Investor's % in the round); Applies when the new shares are fresh issue and no other change occurs.
Debt service coverage ratio (DSCR): DSCR = Cash available for debt service ÷ (Interest + Principal repayment); Lenders prefer a ratio comfortably above 1. A growing startup with losses may fail this test.
Unit economics check: LTV ÷ CAC; Investors often look for LTV well above CAC. Do not quote one fixed ratio as a rule.
Triple bottom line: TBL = Profit (economic) + People (social) + Planet (environmental); It is a framework, not a numerical formula. Assess all three for each decision.
ESG pillars: ESG = Environmental + Social + Governance; Use it to organise practices, risks and disclosures under three heads.
Resource efficiency (illustrative ratio): Energy cost per unit = Total energy cost ÷ Units produced; A simple measure you can use to show improvement over time. Lower is better, other things equal.

Quick revision

Scalability means revenue can grow without costs growing at the same rate.
Scaling up is a deliberate effort to expand capacity, market and reach.
Growth adds resources in proportion; scaling grows output faster than resources.
Scaling should follow evidence of a product-market fit, not precede it.
Scaling too early is a common cause of startup failure.
Key risks include cash strain, quality loss, weak processes, talent gaps and loss of culture.
Match funding to stage: own funds and angels early, venture capital for growth, debt once cash flows are steadier.
Stabilisation means consolidating: strengthening processes, controls, people and cash flows.
Stabilisation protects margins and customer experience after rapid growth.
ESG stands for environmental, social and governance factors.
Good governance and sustainability practices build investor trust and long-term value.
In case answers, end with a clear recommendation tied to the facts given.

Common mistakes

Treating scalability and growth as the same thing. Fix: Always mention cost behaviour. Growth is size; scalability is revenue rising faster than cost.
Saying every growing business is scalable. Fix: Check whether margins improve with volume. Labour-heavy models often grow without scaling.
Treating scaling as the same as growth. Fix: Define scaling as revenue growing faster than cost, through a repeatable model. Give a one-line contrast with growth.
Recommending expansion for a startup whose model is not proven. Fix: Open every case answer with a readiness check on demand, unit economics and processes.
Treating growth and scaling as the same thing. Fix: Define scaling as revenue growing faster than cost. Show this in one line in your answer.
Listing challenges without causes or controls. Fix: Write challenge, cause, control for each point. The control earns the application marks.
Treating VC and PE as the same thing. Fix: Remember VC backs earlier, high-risk, high-growth firms; PE backs more mature firms with proven revenue and often takes larger stakes and stronger governance rights.
Recommending only equity or only debt. Fix: Suggest a mix. Use debt where cash flows or assets can service it and equity for losses and uncertain growth.
Treating stabilisation as stopping growth. Fix: Say it is consolidation that prepares for the next phase of sustainable growth.
Writing only about finance. Fix: Cover all four areas: operations, processes, people and culture, and financial controls.

Exam tips

For a distinguish question, write at least three points in a two-column style using short lines, and add one example for each side.
In case scenario MCQs, look for the cost clue: does the business need proportionally more people or assets for each new customer?
Use the exact phrase revenue rising faster than cost; examiners look for this idea.
Link traits to the case in written answers; a bare list earns fewer marks.
End with a recommendation on readiness to scale, since answers are meant to be applied.
In MCQs, match keywords: new cities means market expansion, new products means diversification, shared capability without merging means alliance, brand format for fees and royalty means franchising.
In case answers, begin with the readiness check, then recommend one main strategy with a reason. Marks go to application, not lists.
Always give one risk for any strategy you recommend, and one safeguard.