By Peet Serfontein
Introduction
Every company, regardless of its size or industry, operates according to a business model which defines how a company creates value, attracts customers and generates revenue. Whether it is a retailer selling products, a bank issuing loans or a technology company charging subscription fees, each business relies on a structured way of earning income and managing costs.
What is revenue?
Revenue is the total amount of money a company earns from selling its products or services before any expenses are deducted. It is commonly referred to as sales, turnover or top-line income, and serves as one of the main indicators of business activity and growth.
For example, if a coffee shop sells 1 000 coffees at R60 each, it generates revenue of R60 000. Similarly, if a software company charges R500 per month to 2 000 users, its monthly revenue amounts to R1 million. Importantly, revenue should not be confused with profit. A company may generate substantial revenue but still operate at a loss if its expenses are too high.
Understanding gross profit margins
A gross profit margin measures how much revenue remains after a company has deducted the direct costs associated with producing or purchasing its goods or services (called cost of sales). It is an important indicator of operating efficiency because it shows how effectively a business converts sales into gross profit before accounting for other expenses such as salaries, rent, marketing and tax.
For example, if a company generates revenue of R1 000 000 and its direct cost of sales amounts to R600 000, the remaining gross profit would equal R400 000. This results in a gross profit margin of 40%. Higher gross profit margins often suggest stronger pricing power, efficient operations, brand strength or a competitive advantage. Companies with higher margins may have greater flexibility to absorb economic pressure, invest in growth or improve shareholder returns. By contrast, lower-margin businesses typically rely on high sales volumes and tight cost control to remain profitable.
Revenue growth vs quality of revenue
Not all revenue growth should be viewed as positive or sustainable. While increasing sales may appear attractive on the surface, it is important to focus on the quality, consistency and sustainability of that growth over time. If top-line income is driven by excessive discounting, aggressive borrowing or unsustainable business practices, profitability and financial stability may eventually come under pressure. For example, a retailer may reduce prices significantly to increase short-term sales volumes, but lower pricing could also weaken profit margins and long-term profitability. In the same way, a high growth tech company that relies heavily on debt to fund rapid expansion may face future financial strain if economic conditions deteriorate or revenue growth slows. High-quality revenue is generally characterised by recurring income streams, diversified revenue sources, predictable cash flow, healthy profit margins and strong customer retention. Businesses that consistently generate this type of revenue are often viewed as more stable, resilient and better positioned for long-term growth.
The importance of cash flow
While revenue and profit are important measures of business performance, cash flow is often one of the most important indicators of a company's financial health. Cash flow measures the actual movement of money into and out of a business. A company may report accounting profits on paper but still experience financial difficulty if cash is not collected efficiently or if operating expenses and debt obligations exceed available liquidity. For example, a business may record large sales, but if customers delay payments, it could struggle to pay suppliers, salaries or lenders. Positive cash flow allows companies to reinvest in operations, reduce debt, pay dividends and strengthen the balance sheet over time. For this reason, companies that combine positive operating cash flow, stable profit margins and manageable debt levels, often have stronger long-term financial stability.
Common types of business models
Product-based business models
Product-based businesses such as clothing retailers, vehicle manufacturers, food producers, electronics companies, and furniture stores generate revenue primarily through the sale of physical goods to consumers or other businesses. These companies buy or manufacture products at one cost and then sell them at a higher price to earn income. For example, a supermarket buys goods from suppliers at wholesale prices and resells them to consumers at retail prices. The difference between the selling price and the cost price contributes to the company's gross profit margin. This model depends heavily on sales volumes, pricing strategy, customer demand and operating efficiency. Companies in this category must manage inventory, logistics and supply chains carefully to avoid excess stock, shortages and rising costs. They are also often exposed to strong competition, changing consumer preferences, inflationary pressures and economic cycles. South African examples include Shoprite Holdings, Mr Price Group and Pick n Pay Stores.
Service-based business models
Service-based businesses earn revenue by providing professional skills, expertise or specialised services rather than selling physical products. Here, the main value offered to customers is knowledge, advice, labour or technical capability. Examples include legal firms, accounting firms, financial advisers, consultants, medical practices, marketing agencies and auditing firms. Revenue is typically generated through hourly billing, fixed service contracts, commissions, retainer agreements or performance-based fees. Unlike product-based companies, service businesses often have lower inventory requirements and fewer manufacturing costs. Their most important asset is usually human capital, meaning the experience, qualifications and expertise of their employees or professionals. This can support relatively high profit margins in specialised industries where expertise are difficult to replicate. However, service-based businesses also face certain limits. Revenue growth may depend heavily on the number and quality of employees available to serve clients. In many cases, expanding operations requires hiring additional skilled staff, which can increase costs and operating complexity. Examples include Discovery, Old Mutual and Ninety One.
Subscription business models
Subscription-based businesses generate recurring revenue by charging customers ongoing fees in exchange for continued access to a product or service. Customers may pay monthly, quarterly or annually, depending on how the offering is structured. This model has become increasingly popular because it creates more predictable and stable cash flow. Instead of relying on once-off sales, subscription businesses aim to build long-term customer relationships and recurring income streams. Examples include streaming platforms, software providers, gym memberships, insurance products, cloud-computing services and investment platforms. Companies such as Netflix, Microsoft and Spotify rely heavily on recurring subscription revenue. Subscription models tend to encourage stronger customer retention and long-term engagement. However, these businesses must continuously deliver value to prevent customer cancellations, commonly referred to as churn- the rate at which customers stop paying for a service. High competition, pricing pressure or declining service quality can all lead to higher churn.
Conclusion
When analysing a company, investors should look beyond short-term share price movements and focus on understanding how the business actually operates and generates revenue. A strong business model can provide valuable insight into a company's long-term sustainability, profitability and growth potential. Additional considerations include whether the company can scale efficiently as it grows, whether profit margins remain healthy and whether management is allocating capital responsibly through expansion, debt management, dividends or reinvestment. The sustainability and quality of revenue also matter, as businesses with predictable and diversified income streams are often viewed as more resilient in changing economic conditions. By understanding these fundamentals, investors can gain a clearer view of a company's true quality, identify risks and make more informed long-term financial decisions.
