INVESTOR LETTER #46
Fixed Cost vs Variable Cost: Differences, Examples & Business Impact
Learn the difference between fixed costs and variable costs, how each affects profitability, operating leverage, and business risk, and why it matters for investors. Discover how a company's cost structure influences profit margins, scalability, break-even point, and long-term earnings growth through practical examples.
INVESTOR NOTE
A business owner thinks in decades. A speculator thinks in minutes.
The Restaurant That Opens Every Morning
Imagine you own a restaurant. Whether one customer walks in or a hundred customers arrive, you still have to pay rent, salaries, insurance, and electricity for keeping the lights on. These expenses don't disappear just because business is slow. They are fixed costs—the bills that keep coming regardless of how much you sell.
Some Expenses Follow Every Sale
Now imagine every time someone orders a pizza, you need dough, cheese, vegetables, and packaging. The more pizzas you sell, the more ingredients you need to buy. These costs rise and fall with sales, making them variable costs.
Why Fixed Costs Feel Scary at First
When a business has high fixed costs, the early days can be stressful. Even if customers don't show up, the company still has to pay its bills. This is why airlines, hotels, and manufacturers can struggle during slow periods—they can't simply stop paying many of their biggest expenses.
The Magic That Happens When Sales Increase
Imagine your restaurant's monthly rent stays exactly the same, but the number of customers doubles. Suddenly, that rent is spread across many more meals. Each meal carries a smaller share of the rent, allowing profits to grow much faster than sales. This is one reason successful businesses become highly profitable as they scale.
Businesses That Need Constant Spending
Some businesses have very few fixed costs but high variable costs. A tailor, for example, buys more fabric only when more customers place orders. During slow periods, expenses naturally fall. These businesses often have lower financial risk but may find it harder to achieve explosive profit growth.
A Software Company Works Differently
Imagine spending months building a mobile app. Once it's complete, selling one more copy costs almost nothing. The salaries paid during development are largely fixed costs, while the cost of serving one additional customer is tiny. This is why many software companies become incredibly profitable as their customer base grows.
Factories Love Full Capacity
Imagine a factory capable of producing one million bottles every month. Whether it produces two lakh bottles or eight lakh bottles, many expenses remain almost unchanged. As production increases, the factory uses its assets more efficiently, often leading to much higher profits.
When Sales Suddenly Drop
Now imagine a shopping mall during an economic slowdown. Customers disappear, but rent, maintenance, security, and employee salaries continue. Businesses with large fixed costs often suffer much more during difficult times because their expenses don't fall as quickly as their sales.
Why Every Industry Is Different
Airlines, telecom companies, cement manufacturers, and hotels usually operate with large fixed costs. Restaurants, trading businesses, and retailers often have higher variable costs. Understanding the cost structure helps investors understand how a business behaves during both good times and bad.
Growth Can Make Profits Explode
Imagine a cinema hall that is already paying for the building, staff, and equipment. Selling another hundred movie tickets doesn't increase costs very much, but it adds significantly to profits. Businesses with high fixed costs often experience rapid profit growth once they cross a certain level of sales.
Not Every High Fixed Cost Business Is Risky
A company with high fixed costs isn't automatically a bad investment. If demand is stable, customers are loyal, and management operates efficiently, such businesses can generate exceptional profits for many years. The key question is whether those fixed costs are supported by consistent revenue.
Understanding the Business During Tough Times
One of the easiest ways to judge a business is to imagine what happens if sales fall by 20% or 30%. Will the company still comfortably pay its expenses, or will it immediately face financial stress? The answer often depends on its mix of fixed and variable costs.
Looking Beyond the Income Statement
Financial statements tell you how much a company spends, but understanding the nature of those expenses reveals much more. Two businesses may report similar profits today while carrying completely different levels of risk because of their cost structures.
Thinking Like the Owner
If you were buying an entire business, you'd want to know which expenses you must pay every month no matter what happens and which expenses rise only when customers increase. This simple distinction helps you understand how resilient the business really is.
Mistakes Beginners Often Make
Many beginners look only at revenue and profit without asking how the business earns those profits. They ignore whether the company has a heavy fixed-cost structure that could become a problem during difficult years. Understanding costs is just as important as understanding sales.
Questions Every Investor Should Ask
Before investing, ask yourself: Which expenses stay the same regardless of sales? Which costs increase only when business grows? Can the company remain profitable during slow periods? Will higher sales lead to much higher profits? Businesses with the right balance of fixed and variable costs often become more valuable as they scale.
INVESTOR PRINCIPLE