When you crack open a Coke at your Memorial Day celebration this weekend, I want you thinking about the Summer Coca-Cola messed with America’s cookout.

Most business founders think business decisions are supposed to be logical.

You research the market.
You gather data.
You test the product.
You improve the product.
Customers should be happy, right?

Then you study something like New Coke and realize business is much messier than that.

Even giants like Coca-Cola who have been around for a over a century forget the psychology of why people buy.

Often purchasing decisions are not made by logic.

They are made due to identity.
Habit.
Memory.
Comfort.
Tradition.

And if you misunderstand that… you can accidentally damage a successful business while trying to improve it.

I think this is one of the most important lessons in entrepreneurship because it forces you to understand a hard truth:

People are rarely just buying the product.

 

Back in the early 1980s, Coca-Cola had a problem.

Pepsi was gaining market share. Their famous “Pepsi Challenge” campaigns showed people doing blind taste tests where many participants preferred Pepsi over Coke.

The data looked convincing.

Pepsi was sweeter. In small sip tests, people often liked it more.

So Coca-Cola did what many companies would do.

They researched.
They tested.
They gathered mountains of consumer feedback.

And eventually they made a massive decision:

They changed the formula for Coca-Cola itself.

In 1985, they launched “New Coke.”

Today we are going to talk about one of the most famous product failures in business history, and why it teaches entrepreneurs that data without human understanding can become dangerous.

The fascinating part when you look into it is:

The research was not fake.

In blind taste tests, many people genuinely preferred the new formula.

Thousands of consumers participated in testing. The numbers supported the launch.

From a purely analytical standpoint, this looked like a smart move.

(And here comes why I teach psychology and knowing your customer so much.)

Then the public lost its mind.

Customers were furious.

People stockpiled old Coke cans.
Hotlines were flooded with complaints.
Protests happened.
Some customers treated it like a cultural betrayal.

And within 79 days, Coca-Cola reversed course and brought back the original formula as “Coca-Cola Classic.”

So the entrepreneurial lesson…

The mistake wasn’t necessarily collecting data. It was just incomplete.

Coca-Cola measured taste preference,but customers were not simply buying a flavored beverage.

They were buying familiarity.
They were buying nostalgia.
They were buying identity.

Coke had become emotionally tied to people’s lives and memories.

Memorial Day cookouts.
Summer vacations.
Baseball games.
American culture itself.

For me, it is memories of my grandfather because the man was always drinking a Coke and snacking on Ritz Bits crackers.

The company accidentally treated an emotional relationship like a math problem.

That happens constantly in business.

A founder sees survey results and assumes they understand the customer.

A restaurant changes recipes because focus groups preferred a different flavor.

A software company redesigns an app because they need to update to stay competitive.

A local business modernizes its branding because it “looks more professional.”

Then customers quietly disappear.

Why?

Because customers often cannot fully explain why they love something.

And even when they can… they usually explain it through logic after the emotional decision has already been made.

This is where first-time founders often struggle.

They think market research is simply collecting opinions.

It is deeper than that.

Good market research is learning how people feel.

What frustrates them?
What excites them?
What identity are they trying to reinforce?
What emotional problem are they solving?

That is why simply asking people “Would you buy this?” is usually weak research.

People are notoriously bad at predicting their own behavior.

You want to study actions, habits, frustrations, routines, and emotional attachment.

That is where the real business insight lives.

And there is another major lesson here for entrepreneurs:

Be very careful changing the core thing people already love.

This is especially true once you have traction.

A lot of founders become obsessed with optimization.

Tweaking.
Rebranding.
Adding features.
Pivoting constantly.

Sometimes that works.

Sometimes you slowly remove the very thing customers were emotionally attached to in the first place.

I have seen this happen with several small businesses.

A restaurant starts making money and renovates to look more upscale and loses the loyal local crowd.

A service business automates everything and loses the personal touch that built referrals.

Vibe is changed to attract a new class of customer… and suddenly the core customer that got them to the dance feels disconnected.

The founder thinks they are improving the business.

The customer feels like something they loved disappeared.

And here is the irony…

New Coke actually tasted fine.

Some people genuinely preferred it.

But business success is not determined inside a laboratory.

It happens in the real world where humans are emotional, irrational, nostalgic, habitual, and deeply attached to meaning.

That is why entrepreneurship is part psychology.

You are not just building products.

You are building relationships between people and what your business represents to them.

 

Weekend Exercise

Pick a business you personally love.

It can be a restaurant, coffee shop, clothing brand, YouTube channel, app, local business… anything.

Now ask yourself:

Why do I actually keep coming back?

Go beyond surface-level answers like “good quality” or “good prices.”

Dig deeper.

Does it make life easier?
Does it feel familiar?
Does it make you feel understood?
Do you trust it?
Does it match your identity or values?
Does it remind you of a certain time in your life?

Then ask yourself one final question:

If they completely changed their core product or personality tomorrow… would you still feel the same way?

That answer will teach you something incredibly important about how customers think.

And if you can learn to understand that emotional layer early as an entrepreneur… you will already be ahead of most people trying to start a business.