Case Study 2 — Why Coffee Shops Keep Opening (and Closing) on Every Block

If you live in any medium-sized American city, you've noticed: coffee shops open constantly. New ones appear on corners that seem already saturated with coffee. Within a year or two, some of them close. New ones open in their place. The cycle repeats.

This is the competitive entry-exit mechanism in action — and it illustrates perfect competition's most powerful prediction: economic profit attracts entry, entry drives profit toward zero, and the firms that can't reach zero-profit equilibrium exit.

Coffee shops are not perfectly competitive in the strict sense (they have differentiated products — your local specialty shop is not identical to Starbucks), so this is technically monopolistic competition (Chapter 20). But the entry-exit dynamics are essentially the same, and the coffee-shop example is the most visible, everyday illustration of how the competitive mechanism works.

The entry story

Suppose a new neighborhood in Millbrook is developing — the "Innovation District" near the new MSU tech incubator. The neighborhood has 5,000 office workers and growing. Currently there's one coffee shop in the area, and it's doing very well: long lines, high prices, packed every morning.

The owner of that coffee shop is earning positive economic profit. Revenue exceeds all costs including the opportunity cost of her time and capital. She's making more money running this coffee shop than she would in her next-best alternative.

The competitive model predicts: other entrepreneurs will notice. They'll see the long lines and think "I could open a coffee shop there." Within 12–18 months, a second shop opens. Then a third. Then a fourth.

Each new entrant takes some customers from the existing shops. The original shop's line gets shorter. It may lower prices to compete. Its revenue per customer falls. Meanwhile, the costs of running a coffee shop in the district are roughly the same for all shops (rent, labor, supplies, equipment).

The entry continues until the economic profit for the marginal shop (the last one to enter) is approximately zero. At that point, no more entrepreneurs are attracted — the profit isn't high enough to justify the investment and the risk.

The exit story

Now suppose the district hits a downturn. A major employer relocates. Foot traffic drops by 30%. Revenue for each coffee shop falls. Some shops — particularly the ones with the highest rents, the least efficient operations, or the worst locations — start losing money. Their revenue no longer covers their total costs.

In the short run, they keep operating as long as revenue covers variable costs (the shutdown rule from Chapter 17). But when the lease expires or the losses become unbearable, they close.

The exits reduce the number of shops. The remaining shops capture a larger share of the (now smaller) customer base. Revenue per shop rises. The exits continue until the remaining shops are (roughly) breaking even — zero economic profit.

What the coffee-shop cycle teaches

1. Entry and exit are the competitive process. The mechanism that drives profit to zero is not regulation, not government policy, not altruism. It is self-interest: entrepreneurs enter when they see profit, and they exit when they see losses. The aggregate effect is that profits are competed away and markets converge toward zero economic profit.

2. "Too many coffee shops" is the market's way of finding the right number. The overshoot-and-correction pattern (too many shops open, some fail, the survivors settle at the right number) is not a sign of market failure. It is the competitive process working itself out. The failures are the market's way of discovering which locations, which concepts, and which operators are viable.

3. Zero economic profit doesn't mean owners are unhappy. A coffee shop earning zero economic profit is still paying its owner a salary, covering its rent, and providing returns on the invested capital. It is earning a normal return — the same as the owner could earn in the next-best alternative. Some owners are perfectly content with this. Others want more and exit to try something else.

4. Product differentiation slows but doesn't stop the process. Each coffee shop is a little different — different ambiance, different menu, different location. This differentiation gives each shop some pricing power (unlike a corn farmer, a coffee shop can charge slightly more than its neighbor if the coffee is better or the vibe is more appealing). But differentiation doesn't prevent entry, and entry still drives profits toward zero over time. The process just takes longer than in a perfectly homogeneous market.

5. Location matters — a lot. In the coffee-shop market, the most important determinant of success is location. A shop on a busy corner with high foot traffic can survive at higher rent because of higher volume. A shop on a quiet side street may fail even with lower rent. The competitive model assumes homogeneous products; the real world introduces spatial differentiation as a major factor. We will see this more in Chapter 20.

The numbers (stylized)

A typical independent coffee shop in a mid-sized American city: - Monthly revenue: ~$40,000–60,000 - Rent: ~$4,000–8,000/month (varies enormously by location) - Labor (4–6 employees): ~$15,000–25,000 - Cost of goods (coffee, milk, pastries, cups, etc.): ~$10,000–18,000 - Utilities, insurance, equipment: ~$3,000–5,000 - Owner's salary (implicit or explicit): ~$4,000–8,000 - Total costs: ~$36,000–64,000

At these numbers, a coffee shop earning $50,000/month in revenue and facing $48,000/month in costs (including the owner's salary) has an economic profit of roughly $2,000/month — a thin margin that one bad month or one competitor's opening can eliminate.

This is what zero economic profit looks like in practice: not zero dollars, but a thin margin that barely covers the opportunity cost of the owner's time and capital, and that can easily flip to a loss if conditions change.

Discussion questions

1. You notice three new coffee shops opening in the same neighborhood within six months. The competitive model predicts this is a response to positive economic profit. What evidence would you look for to confirm this?

2. Two of the three new shops close within 18 months. Is this a market failure? Or is it the competitive process working?

3. Starbucks has thousands of locations and significant brand recognition. Does Starbucks have market power? Is it a price taker? If not, how does its presence affect the competitive dynamics for independent shops?

4. The case study says "zero economic profit doesn't mean owners are unhappy." Do you find this convincing? Are there non-monetary reasons people open coffee shops?

5. Apply the coffee-shop analysis to another industry with frequent entry and exit: restaurants, barbershops, food trucks, or Etsy sellers. Does the same competitive mechanism operate?