At six in the morning, few people are thinking about economics as they order their first cup of coffee.

The decision seems much simpler: coffee, then off to work.

But imagine that the cup you’re used to buying for SAR 15 now costs SAR 18. Just three riyals more, but enough to raise an economic question that has been asked for decades:

What will consumers do when the price goes up?

They may not stop buying coffee. They may not even feel the increase is that significant. But they might buy it fewer days a week, order a smaller size, look for another café, or simply decide that their daily coffee is no longer worth the new price.

This is where one of economics’ simplest and most widely used ideas comes in: the Law of Demand.

Price doesn’t just change desire—it changes decisions

In the Managerial Economics course (ECO 506) at Al Yamamah University, Dr. @Faiq Al-Akayleh presents the law of demand as one of the fundamentals students need to understand how markets work.

The idea seems straightforward: when the price of a good rises, the quantity demanded falls, and vice versa, all else being equal.

But the word “quantity” is key.

An economist doesn’t ask: Do you still like coffee?

Instead, they ask:

How many cups will you buy at the new price?

Coffee may remain part of your routine, but a higher price may lead you to rearrange that routine.

That’s the difference between wanting a good and deciding how much of it you’ll actually buy at a given price.

Consumers reassess their priorities

Consumers don’t have unlimited budgets.

Every riyal spent on coffee is a riyal that can’t be spent on something else.

So when the price changes, consumers reconsider their choices. At SAR 15 a cup, buying coffee every day may seem like an ordinary decision. At SAR 18, they might start asking: Do I need it every day?

That doesn’t mean everyone will make the same choice.

But as a general economic pattern, a price increase leads to a fall in the quantity demanded under ordinary circumstances. This is represented by a downward-sloping demand curve. Dr. @Faiq Al-Akayleh’s course material explains the concept using a table that links the prices of a good to the quantities consumers choose to buy, then plots that relationship as a demand curve.

Put simply, the curve shows what happens at different prices:

Higher price, lower quantity.

Lower price, higher quantity.

But be careful: lower sales don’t always mean lower demand

This is where things get more nuanced.

Suppose a café raises the price of a cup of coffee from SAR 15 to SAR 18, and its sales then fall.

It’s easy to say: demand has fallen.

But in economic terms, it may be more accurate to say that the quantity demanded fell because the price increased.

The distinction isn’t just a matter of wording.

When the price of the good itself changes, with all other factors held constant, we move from one point to another along the same demand curve. The course material illustrates this with an example involving apples: a price drop from SAR 5 to SAR 2.5 led to an increase in the quantity demanded, moving from one point to another along the same curve.

But if something else changes, such as consumers’ income or preferences, or the prices of other goods, the demand curve itself may shift.

It’s a small difference in terminology, but a big one in analysis.

The market doesn’t run on price alone

If coffee becomes more expensive, price is an obvious factor. But it isn’t the only thing that determines what happens.

Consumers’ incomes may change. A substitute may appear. Their preferences may shift. And their expectations about future prices may change.

That’s why the chapter in which the professor discusses demand theory sets out several determinants of demand, including the price of the good itself, the prices of other goods, income, wealth, access to credit, tastes and preferences, the size and composition of the population, and expectations.

This brings us to an important rule of economic thinking:

Don’t attribute everything to the factor you can see right in front of you.

If coffee sales fall, perhaps its price went up. But perhaps something else changed.

Economics tries to separate these causes from one another.

The café owner sees the question differently

Consumers see a price increase in terms of their budgets.

Café owners see it from another angle:

Will the higher price per cup make up for selling fewer cups?

Raising the price may mean more revenue per cup, but it may also mean selling fewer cups.

That’s why understanding demand matters to businesses. Pricing isn’t just a matter of adding a riyal or two to a product’s price; it’s a decision about how consumers will respond.

That’s what makes the law of demand more than just a graph in an economics textbook.

It describes how people make decisions when things become more or less expensive.

Three riyals reveal a bigger story

The difference between SAR 15 and SAR 18 may not seem significant in one person’s budget.

But economics isn’t focused on just one person.

If thousands of consumers make similar decisions, the combined effect will show up in café sales and across the market.

That’s how we move from an individual decision in front of a price list to an economic phenomenon that can be measured.

The price changes.

The consumer responds.

And the market records the result.

When coffee becomes an economics lesson

Perhaps that’s why some of the most important economic ideas start with very ordinary things.

A cup of coffee.

A plane ticket.

A car.

An apartment.

They’re all different products, but the question can be the same:

How do people’s choices change when prices change?

In the case of coffee, the basic answer behind the law of demand is clear: if the price rises, the quantity demanded tends to fall; if the price falls, it tends to rise, all else being equal.

But the value of the idea isn’t in memorizing it.

Its value lies in giving us a better way to understand what’s happening around us.

So when you see a price change, don’t just ask:

How much does it cost now?

Also ask:

What will people do next?

Disclaimer: This material was prepared under the supervision of a Yamama Insights editor with the assistance of artificial intelligence tools for financial education purposes. It is not a recommendation to buy, sell, or hold any security, and reflects the views of its authors, not those of the platform.