Can Too Much Availability Make a Service Business Look Less Desirable?

The Question

If two service providers appear otherwise similar, can the number of appointments they have available influence which one a customer chooses?

That question matters because service businesses often treat calendar availability as purely operational. More open slots look like more convenience, and more convenience should theoretically make booking easier.

But customers do not necessarily see only convenience. When the provider is unfamiliar, they may also use what other customers appear to be doing as a clue about quality. A completely open schedule can suggest that nobody else is booking. An almost completely booked schedule can imply popularity, but it can also make the business look rushed, congested, or difficult to schedule.

Those signals can pull in opposite directions.

What the Research Examined

Kaluza, Voigt, and Paetz conducted a series of online experiments examining how booking status affected customers’ choices between service providers. [1]

In the first experiment, participants imagined booking a routine dental appointment and chose between otherwise similar providers displaying different numbers of open appointment slots. The researchers varied the visible availability from almost fully booked to completely open while ensuring that the participant’s preferred appointment time remained available in each condition. [1]

The researchers then expanded the work to different service categories and examined whether booking status continued to matter when customers could see other quality-related information such as ratings, travel distance, and price. [1]

This design allowed them to separate two competing interpretations of appointment availability: a quality-inference effect, where visible demand can make a provider appear more desirable, and a scarcity effect, where too little availability makes the provider less convenient or suggests congestion. [1]

What the Research Found

The dental experiment showed both effects.

When participants chose between a provider offering eight appointments and one with a completely open schedule of 32 appointments, 59% chose the provider with eight available slots. But when the choice was between only two available appointments and a fully open schedule, 60% chose the provider offering more availability. Both differences were statistically significant in the experiment. [1]

That pattern is important because it does not support the simple rule that “scarcity increases demand.”

The results were nonlinear. Some visible demand could make the provider appear more attractive, but once availability became too limited, the disadvantages of congestion and reduced scheduling flexibility began to outweigh that quality signal. [1]

The attractive state was not “fully booked.”

It was busy enough to signal demand while still giving the customer useful choice.

An Empty Calendar Can Become a Quality Signal

Why would having more appointments available ever make a provider less attractive?

The researchers interpret the effect through observational learning. When customers do not already know the provider’s quality, they may infer something from the choices other customers appear to have made. A partly booked schedule suggests that other people have already selected that provider, while a completely open schedule can look like an absence of demand. [1]

That mechanism is related to what researchers have called the “empty restaurant” effect. [2]

Kremer and Debo experimentally studied how waiting time can function as a quality signal when some consumers know the underlying quality and others do not. Their results showed that uninformed consumers could use waiting as information: short waits could sometimes lower perceived quality, while longer waits could increase purchase likelihood when customers believed the queue reflected informed demand. [2]

That does not mean waiting is inherently good. It means visible demand can communicate information when quality is otherwise uncertain.

Too Much Scarcity Creates a Different Problem

The appointment research also shows why businesses should be careful with the opposite extreme.

When too few appointments remained, customers became less interested in the provider. Participants associated highly utilized schedules with concerns such as a crowded waiting room, a provider being rushed, and reduced flexibility in choosing an appointment time. [1]

That turns the usual scarcity narrative on its head.

A customer may interpret limited availability as evidence that a provider is popular, but there is a point where the same signal starts communicating inconvenience.

The customer is not evaluating popularity in isolation. They are also trying to answer:

Can I actually get the service when I need it?

The Type of Service Matters

The effect was not equally strong across every service the researchers tested.

For non-standardized services—where customers may expect meaningful quality differences between providers—the researchers found evidence of the quality-inference effect and a nonlinear relationship between availability and provider preference. [1]

For a standardized government service, they did not find evidence that customers were using booking status to infer provider quality. In that context, customers appeared to care more directly about having enough appointment choices available. [1]

That distinction matters for service businesses because appointment availability may carry more meaning when customers believe provider quality varies substantially.

Choosing a photographer, consultant, dentist, contractor, stylist, attorney, or other expertise-driven provider is different from booking a service where the outcome is expected to be nearly identical regardless of who performs it.

Ratings and Price Do Not Necessarily Erase the Signal

The researchers also tested booking status alongside other information such as star ratings, travel distance, and prices. [1]

Those signals mattered, but booking status still had a meaningful influence on provider preference under the conditions studied. [1]

That is useful because real booking experiences rarely present availability by itself. Customers may be looking simultaneously at reviews, prices, credentials, location, service descriptions, and the calendar.

The booking interface becomes one signal among several.

It does not necessarily stop communicating just because stronger proof exists elsewhere.

Popularity Can Affect Online Service Choices More Broadly

The effect is not limited to calendars.

Tucker and Zhang conducted a field experiment on a website listing wedding service vendors. After popularity information was introduced, customer behavior changed in ways consistent with observational learning under the conditions studied. [3]

That is particularly relevant to service businesses because customers often cannot completely evaluate quality before buying.

Other customers’ behavior becomes part of the evidence.

Reviews are one version of that signal.

A visible booking calendar can be another.

What This Does—and Doesn’t—Tell Us

The evidence supports a useful conclusion: customers can interpret visible booking availability as information about a service provider, not merely as a list of times. [1]

In the Kaluza research, moderate utilization could make certain non-standardized service providers more attractive than an entirely open schedule, while extreme scarcity reduced attractiveness because customers valued flexibility and wanted to avoid apparent congestion.

What this research does not justify is manufacturing scarcity.

It does not prove that every service business should hide available appointments, block legitimate booking options, or pretend to be busier than it is. It does not establish one ideal percentage of calendar occupancy for contractors, consultants, healthcare providers, salons, agencies, or other businesses.

And it does not show that manipulating a calendar will increase qualified leads or revenue.

The studies tell us that availability itself can communicate.

What a business should communicate with that information is a separate decision.

What This Means for Your Website

Treat the booking experience as part of how the customer evaluates the business, not simply the utility that appears after they have already decided.

When someone reaches a calendar, the interface may answer more than “When are you free?” It can also create impressions about whether the company is in demand, how convenient the service will be, whether the provider seems overwhelmed, and whether the customer has enough control over the next step.

The best response is not artificial scarcity.

It is a booking experience that communicates real availability clearly while giving customers enough context and flexibility to make a confident choice.

Strengthen the other signals that tell the customer why the business is worth choosing. Reviews, case studies, credentials, specific service explanations, team information, guarantees, and proof of previous work can communicate quality directly rather than forcing customers to infer it from the calendar.

A booking system is a weak substitute for real proof.

The stronger the proof elsewhere in the experience, the less the customer has to guess what availability means.

A booking interface can show the next few useful appointment options and still give customers a clear path to view additional times. That can make the decision easier without pretending that unavailable times are booked.

The design question is:

How much scheduling information does someone need right now to choose a useful next step?

That is different from asking how many empty calendar cells the system is capable of displaying.

If customers see almost no availability, they may anticipate inconvenience, long waits, lack of flexibility, or a provider who is too busy to give them adequate attention.

That makes aggressive scarcity messaging particularly questionable for service businesses.

“Only one appointment left!”

“Booked for weeks!”

“Almost no availability!”

Those messages may create urgency, but they can also communicate that working with the company will be difficult.

Being in demand and being accessible are not the same thing.

A company that promises “fast service” but shows no appointments for three weeks is creating a credibility problem. A premium consultant who intentionally takes only a small number of engagements may reasonably have limited availability, but that scarcity should make sense in the context of how the service is positioned and delivered.

The calendar does not sit outside the brand promise.

It is evidence about whether the promise is believable.

Do not reduce that flexibility solely because a smaller set of appointments looks more popular. The study linked preference for more availability to desired flexibility and concerns about providers appearing too busy; its motive analysis did not establish one exclusive explanation. [1]

If several legitimate times are available, customers should be able to reach them.

The objective is not to manufacture demand.

It is to present the scheduling decision in a way that remains understandable, credible, and convenient.

Did more people begin booking? Did they complete the booking? Did they choose useful appointment times? Did rescheduling increase? Did no-shows change? Did the resulting appointments become qualified business?

Those outcomes matter more than whether a calendar treatment generated more clicks.

A booking interface is successful when it connects the right customer with a viable next step.

The Practical Takeaway

The number of appointments a customer sees can communicate more than availability.

Research suggests that, for some services, a completely open schedule can reduce interest because customers infer weak demand, while an almost-full schedule can reduce interest because customers anticipate congestion and lose scheduling flexibility.

The useful lesson is not to manufacture scarcity.

It is to recognize that booking design becomes part of the customer's evaluation of the provider.

Show truthful availability. Give people enough choice to act. Support the calendar with real evidence of quality so customers do not have to infer more from it than they should.

The best booking experience should make the business look wanted without making the customer feel unwanted.

Where This Applies at CTG

Calls, Forms & Booking

We look at the complete booking experience: when availability is introduced, how appointment choices are presented, how much flexibility the customer has, and whether the interface makes moving forward feel easier or more difficult.

Conversion Optimization

Booking availability creates testable hypotheses. We can evaluate different truthful presentation strategies against completion, lead quality, booked appointments, rescheduling, no-shows, and downstream business outcomes rather than assuming scarcity helps.

Website Redesigns

Booking systems are often treated as external utilities that begin after the website's work is finished. We treat the transition into scheduling as part of the customer experience and make sure the interface supports the positioning and expectations established by the site.

New Websites

A new site is an opportunity to integrate service information, proof, availability, and the next step coherently instead of sending a customer from a persuasive website into a disconnected scheduling experience.