Every industry has rules that appear in contracts, legislation, operating manuals and company policies, but some of the most influential rules in business are never written down at all. They survive because everybody in the industry has gradually learned to accept them as simply the way things work.
Customers return rental movies and pay a penalty if they are late. Cars are sold through dealerships. Travellers sleep in hotels. Music is purchased and owned. Furniture arrives assembled. Successful companies demonstrate their strength by producing profits.
For years, none of those ideas sounded particularly strange. They weren’t necessarily foolish rules either. Most had developed for understandable reasons and, at some point, had solved genuine problems.
Then somebody asked whether the problem still required the same solution.
That question sits behind some of the most consequential business innovations of the past few decades, because the companies that changed their industries didn’t necessarily begin by inventing something completely new. Often, they looked at something everybody else regarded as unavoidable and asked a much more uncomfortable question:
Why does it have to work this way?
The answer sometimes revealed that the rule was still necessary. On other occasions, however, it revealed something far more valuable: the world had changed, but the industry’s assumptions had not changed with it.
A customer would walk into a video store, choose a movie, take it home and agree to return it within a specified period. If the movie came back late, there was a penalty.
There was a perfectly sensible business reason for this. A physical copy of a movie could only be rented to one household at a time, which meant a video sitting forgotten beside someone’s television couldn’t be rented to another customer. The rental company therefore needed some mechanism to encourage people to return its inventory.
But the penalty also created one of the strangest relationships in retail: a company could make additional money when its customer made a mistake.
Netflix’s original DVD-by-mail subscription model approached the problem differently. Rather than building the relationship around individual rentals and late-return penalties, customers could keep discs until they were ready to return them, with the subscription structure limiting how many they could have at once.
The underlying problem hadn’t disappeared. Netflix still needed its DVDs back.
What changed was the mechanism.
Then Netflix did something even more interesting. Having challenged the assumptions of the video-rental store, it eventually had to challenge the assumptions of its own successful DVD-by-mail business as broadband made streaming increasingly practical.
That is an important part of the story because unwritten rules aren’t only inherited from old industries. Successful companies create their own.
A business model can begin as a rebellion against convention and eventually become the convention its own people are afraid to question.
There were good historical reasons for it. Selling cars required local inventory, salespeople, servicing capability, financing relationships and physical locations spread across enormous geographic areas. A dealer network allowed manufacturers to achieve that reach without owning thousands of retail operations themselves.
Tesla looked at that structure from the perspective of a new entrant and chose a different approach, selling directly to customers through its own stores and online channels rather than building a conventional franchised dealer network. What followed demonstrated something particularly useful about unwritten rules: Business convention and written regulation can become intertwined.
Tesla’s direct-sales strategy encountered resistance and legal restrictions in parts of the United States because dealer-franchise laws differed from state to state. The company wasn’t simply challenging an outdated habit; it was confronting an ecosystem of established businesses, regulation, consumer-protection arguments and commercial interests that had grown around the existing model.
That distinction matters.
Not every intermediary exists because nobody thought to remove it. Intermediaries often perform valuable functions, and sometimes the rules protecting them were created for legitimate reasons. The useful question is not simply, Can we eliminate the middleman?
It is: What function does the middleman perform, and is there now a better way to perform it?
Tesla’s significance wasn’t merely that it removed dealerships. It forced the automobile industry to reconsider which parts of the traditional distribution structure were essential and which parts existed because the industry had spent decades organising itself around them.
The building had a name over the entrance. There was usually a reception desk. Somebody cleaned the rooms. Standards were controlled by the hotel operator or brand, and that institutional structure gave travellers a reason to trust that the room they booked would actually exist when they arrived.
The assumption underneath all of this was deeper than it first appeared :
Hospitality required dedicated hospitality inventory.
Yet at the same time, millions of bedrooms, apartments and homes around the world were sitting empty for at least part of the year.
Airbnb‘s breakthrough wasn’t discovering that people could sleep in somebody else’s house. Humans had been doing that for centuries. The challenge was making strangers sufficiently comfortable arranging that exchange at enormous scale.
Profiles, reviews, payments, photographs, identity systems, host histories and platform rules created mechanisms through which people could make judgments about strangers they had never met.
Airbnb therefore didn’t eliminate trust or eliminate the intermediary. In many respects, Airbnb itself became the intermediary.
What it challenged was where trust had to come from.
A traveller no longer necessarily needed a Hilton or Marriott sign outside the building to feel sufficiently confident about booking accommodation. Digital reputation systems could make an ordinary apartment, spare bedroom or house legible to a stranger on the other side of the world.
The valuable question wasn’t :
How do we build another hotel chain?
It was :
Does the accommodation actually have to be a hotel?
That small shift in the question unlocked an enormous amount of previously invisible supply.
If you wanted to hear a particular album whenever you chose, you bought the record, cassette or CD. Even when music became digital, the early commercial model largely preserved the same assumption: Purchase a song or album and add it to your collection.
The container changed. But the underlying rule remained.
Spotify helped popularise a fundamentally different relationship between customer and product. Instead of paying primarily to possess individual recordings, listeners could pay for access to a vast catalogue.
That distinction sounds obvious now because streaming has become ordinary. Before it became ordinary, however, it required questioning an assumption deeply embedded in the economics and culture of the industry :
- What was the customer actually buying?
- Was it the file?
- Was it permanent possession?
- Was it the ability to display a collection?
- Or was the underlying desire simply to hear almost any song whenever they wanted?
Once reliable internet connections, smartphones, licensing systems and digital distribution made continuous access practical, ownership was no longer the only way to satisfy that desire.
This is one of the most useful places to look for unwritten rules in any business.
Sometimes customers don’t actually want the thing your industry has spent decades selling them. They just want what the thing allows them to do.
That is hardly an unreasonable expectation. A company that permanently spends more than it earns eventually discovers that enthusiasm doesn’t pay its bills.
Yet there is a subtler assumption hiding underneath that obvious truth: That a rapidly growing company should maximize, or demonstrate near-term profitability, as evidence that the business is succeeding.
Amazon repeatedly challenged that expectation during its rise by reinvesting heavily in warehouses, technology, logistics, new categories and infrastructure. For long periods, the company’s enormous sales growth produced surprisingly modest profits relative to its scale.
From a conventional short-term perspective, that could look like weakness.
From Amazon’s perspective, much of that spending was building capabilities that could make the company far more formidable later.
The distinction matters because the lesson is not that profits are irrelevant or that founders should simply keep losing money while assuring everybody that the future will eventually vindicate them. Amazon was able to pursue its strategy because investors continued to provide the company with the capital and confidence necessary to fund it. The deeper question was about time horizon.
If spending one dollar today could create infrastructure, technology or customer relationships worth considerably more in the future, was retaining that dollar as current profit necessarily the smartest measure of success?
Amazon didn’t prove that profitability doesn’t matter. It demonstrated that sometimes the more useful question is when it should matter most.
Once assembled, it occupies an enormous amount of space. A truck can carry only so many. A warehouse can store only so many. Moving it through doorways becomes difficult, delivery becomes expensive and the retailer spends considerable resources transporting something that, in physical terms, consists largely of empty space surrounded by pieces of wood.
Now take the same wardrobe apart. Suddenly the economics look very different. The components can be packed into a relatively flat box. More units fit into warehouses and trucks. Customers may be able to take the product home themselves. There is, however, a catch :
Somebody still has to assemble it.
The conventional furniture business largely treated that as part of the product it provided. IKEA shifted a significant part of that work to the customer.
On paper, asking customers to do more work sounds like a terrible customer-experience strategy. Yet IKEA combined that trade-off with lower costs, distinctive design, enormous stores, immediate product availability and an experience in which self-assembly became an expected part of the proposition.
This is why questioning an unwritten rule is more complicated than simply removing something expensive.
IKEA didn’t merely say, Let’s stop assembling furniture.
It redesigned enough of the surrounding system that asking the customer to participate created advantages elsewhere.
That leads to a much more interesting business question :
Which parts of your product or service does your company perform simply because customers have historically expected you to perform them—and would customers willingly do some of those things themselves if the trade-off were worthwhile?
At first glance, these six companies appear to have followed the same rule-breaking playbook. Look more closely, however, and the similarity begins to disappear.
Netflix questioned a revenue mechanism tied to customer penalties and later challenged its own distribution model. Tesla questioned the traditional route between manufacturer and buyer. Airbnb questioned where accommodation inventory and trust had to come from. Spotify questioned whether access could replace ownership. Amazon questioned the time horizon through which business performance should be judged. IKEA questioned which parts of the production and delivery process had to remain the company’s responsibility.
They weren’t breaking the same kind of rule. They were finding assumptions hidden in different parts of the business model.
That is what makes unwritten rules so difficult to see. They can hide inside pricing, distribution, ownership, customer expectations, professional standards, intermediaries, inventory, qualifications, geography, working hours, payment terms, technology and even the definition of what the product actually is.
Once an assumption has survived long enough, people stop describing it as a decision. They simply describe it as how the industry works. And that is precisely when it becomes interesting.
There is an uncomfortable problem with stories like Netflix, Tesla, Airbnb, Spotify, Amazon and IKEA.
They survived.
That means we can look backwards from their success and make their decisions appear more obvious than they were at the time.
For every famous company that challenged an established assumption and transformed an industry, there are countless businesses that challenged conventional wisdom and discovered that conventional wisdom was right, that customers didn’t want the alternative, that the economics didn’t work, or that the supposedly unnecessary part of the industry was performing a function the founders had underestimated.
Those companies rarely appear in inspirational business articles.
That creates survivorship bias.
It can make successful rule breakers appear to prove that convention is usually wrong, when the more useful lesson is considerably less dramatic.
Breaking an unwritten rule isn't the advantage. Discovering that the rule no longer solves the problem better than the alternative is the advantage.
That difference is central to the NoRuleBook philosophy.
Independent thinking doesn’t mean automatically assuming that an established industry is stupid. Nor does it mean doing the opposite of whatever everybody else does. It means refusing to give an assumption permanent immunity from examination simply because it has existed for a long time.
There is a temptation, particularly after reading stories about disruptive companies, to walk into a business and immediately begin searching for things to destroy. But doing this misses the point.
The better starting question is :
What problem was this rule originally created to solve?
Late-return rules helped rental businesses recover scarce physical inventory. Dealer networks helped manufacturers distribute and support vehicles across enormous territories. Hotels created predictable standards for strangers travelling away from home. Music ownership gave people reliable repeated access to recordings. Furniture assembly gave customers a finished product. Near-term profitability demonstrated that businesses could sustain themselves.
Those weren’t ridiculous ideas.
The world around them changed. Technology changed. Distribution changed. Consumer behavior changed. Infrastructure changed. Information became cheaper. Reputation became easier to share. Transactions became easier to coordinate between strangers.
And sometimes the rule remained after the conditions that had made it necessary began to disappear.
That is where opportunity tends to hide.
Not in rejecting convention for the sake of being unconventional, but in noticing when the reason behind the convention has changed.
The most valuable question in business is often not “What does everybody else do?” but “What problem made everybody start doing it this way in the first place?”
The companies in this article are useful not because you should imitate Netflix, Tesla, Airbnb, Spotify, Amazon or IKEA, but because each one demonstrates what can happen when somebody stops treating an industry assumption as an unquestionable fact and starts investigating the problem underneath it.
Your opportunity, if there is one, will almost certainly look different.
It may be buried inside the way your industry prices its services, reaches customers, hires people, defines professionalism, uses intermediaries, manages inventory or decides which parts of a process customers will tolerate. It may even be something you currently do without thinking about it because everybody around you does exactly the same thing.
The challenge is learning how to see it.
That is why the next step is not to copy one of the companies above, but to examine your own industry systematically. In How to Identify the Unwritten Rules in Your Industry, we developed the NoRuleBook Unwritten Rule Audit. A practical framework for identifying an accepted convention, understanding why it exists, testing whether its original logic still holds and deciding whether there may now be a better alternative.
Because the objective isn’t to break more rules. It’s to stop following rules you have never actually examined.
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