Cost structure

So far we have looked at how you make money. Now we flip the page: what does it cost to run the model? The cost structure is the last building block, and together with revenue it decides whether anything is actually left over. To understand your costs is to understand where the business can afford to grow and where it bleeds.

Fixed vs. variable costs

The most important distinction is between fixed and variable costs.

• Fixed costs don't change with how much you sell in the short term: rent, salaries, insurance, tool subscriptions. They occur whether you sell one unit or a thousand.
• Variable costs follow sales: raw materials, shipping, payment fees, server hours per user. Sell twice as much and they roughly double.

Why does this matter? Because a model heavy on fixed costs is risky at the start (you pay a lot before you have customers), but becomes cheap per unit once volume arrives. A model heavy on variable costs is safer early, but leaves less to gain from scale.

Value-driven vs. cost-driven model

Broadly, businesses choose one of two strategies:

• Cost-driven: everything is about keeping the price low by squeezing costs. Low-price players live here.
• Value-driven: you compete on value and experience, and accept higher costs to deliver something customers pay extra for.

Neither is "right" — but your model should know which one it is. A value-driven premium player that suddenly cuts costs on what customers actually pay for undermines itself. A cost-driven player that builds in expensive details loses its price advantage.

Economies of scale and margins

Margin is what's left after costs. Two versions are useful:

• Contribution margin (gross margin): price minus the variable costs per unit. This is the money each unit contributes toward covering the fixed costs.
• Operating margin: what's left after all costs.

Economies of scale arise when the cost per unit falls as you grow — the fixed costs spread over more units, and you negotiate better prices. Software is extreme here: the hundred-thousandth download costs almost nothing. Physical goods have weaker economies of scale, because each unit costs something to make and ship.

That is why gross margin is one of the first numbers an experienced investor looks at: it reveals how much room the model has to carry marketing, salaries and growth. A margin of ninety øre per krone, typical for software, gives completely different options than ten øre per krone, typical for pure retail. Two companies with the same turnover can therefore have wildly different ability to survive a bad month.

Where the money actually goes

In a startup the most important cost is often the one you don't put on a single line: the time and money you spend before the model pays for itself. This is often called "burn" — how much money you lose per month. Two common surprises:

1. Customer acquisition is more expensive than you think. Marketing and sales cost real money for every customer, which we put numbers on in the next lesson.
2. Small, fixed subscriptions pile up. Ten tools at "just" a few hundred NOK each quickly become a significant fixed cost.
3. Wasted money on things you don't measure. Money spent on a channel you never follow up on disappears without you ever learning whether it gave anything back.

Knowing where the money goes is the first step to steering it — not to cut everything, but to spend more on what works and less on what doesn't.

Do this now

List your five to ten biggest costs and mark each as fixed or variable. Then calculate the contribution margin on what you sell: price minus variable cost per unit. Is the number positive? How many units must you sell to cover the fixed costs? Write down the answer — it leads straight into unit economics.