In the startup world, there’s a long-standing rule:

When Amazon enters your market, your company dies.

That’s what investors believed. That’s what founders believed. And historically, that’s exactly what happened.

Yet one company broke that rule.

Square — now part of Block and valued at over $50 billion — survived a direct attack from Amazon.

In an interview on The Founder Podcast with Chris Lee, Square co-founder Jim McKelvey explained how the company not only survived Amazon, but ultimately forced the tech giant to abandon the market entirely.

And according to McKelvey, it wasn’t because Square was bigger, faster, or better funded.

It survived because it built something he later called “The Innovation Stack.”

The Problem That Sparked Square

Square didn’t start in a boardroom.

It started in a glassblowing studio.

McKelvey, an artist and entrepreneur, was trying to sell a piece of glass art to a customer from Panama. The customer wanted to pay with American Express.

There was just one problem.

He couldn’t accept it.

“She only had an American Express card… and I lost the sale. I was pissed.”

Standing there, staring at his phone, McKelvey had a simple thought:

Why can’t this device become a credit card machine?

After all, phones had already become:

• Cameras
• Maps
• TVs
• Communication devices

But they couldn’t accept payments.

So he called someone he trusted: Jack Dorsey, who had once been his intern.

Two weeks later, Square was born.

When Amazon Tried to Kill Square

Three years after launching, Square faced what most startups consider a death sentence.

Amazon copied their product.

Then they did what Amazon always does:

• Lowered the price
• Leveraged the Amazon brand
• Targeted the same customers

At the time, McKelvey said no startup had ever survived an Amazon attack.

“Monsters fighting squirrels… the squirrel’s dead.”

Square expected to lose.

Instead, something strange happened.

Amazon quit.

After a year of competition, Amazon shut down its payment reader business — and even sent their customers Square readers.

That’s when McKelvey started asking a bigger question:

Why did Square survive?

The Discovery of the Innovation Stack

To understand what happened, McKelvey spent two years researching companies that survived larger competitors.

One pattern kept appearing.

Companies that solved truly unsolved problems didn’t just build one innovation.

They built many interconnected innovations — each necessary for the system to work.

He called this:

The Innovation Stack.

Instead of copying industry playbooks, these companies had to invent solutions at every level.

For Square, that meant reinventing:

• Payment hardware
• Mobile payment software
• Merchant onboarding
• Fraud systems
• Pricing models
• Customer support

Each innovation depended on the others.

Remove one piece — and the entire system collapsed.

But together, they created something competitors couldn’t easily replicate.

The Moment Every Entrepreneur Encounters

McKelvey believes every true entrepreneur eventually faces a moment most people avoid.

You encounter a problem that no one has solved before.

There’s no playbook.

No YouTube tutorial.

No expert to copy.

And when that happens, your brain panics.

“Every fiber of your body will tell you you’re wrong.”

Your instincts try to pull you back into the herd.

Friends tell you it won’t work.

Your own fear tells you to stop.

But here’s the key insight McKelvey discovered:

That fear is actually the signal you’re doing something original.

Why Real Entrepreneurs Aren’t Motivated by Money

Today, entrepreneurship is trendy.

But McKelvey argues the original definition meant something very different.

Historically, an entrepreneur was:

“Someone in business doing something weird.”

Not someone opening a coffee shop.

Not someone following a proven formula.

Instead, a true entrepreneur tackles problems without known solutions.

And the people most likely to succeed aren’t chasing fame or money.

They’re chasing something else.

“People who are pissed off about something that they think is wrong in the world… those people get up 20 times after you knock them down 19.”

Anger. Frustration. Obsession.

Those emotions, McKelvey says, are often the real fuel behind world-changing companies.

The Hidden Cost of Billionaire Success

You might assume becoming a billionaire makes life easier.

McKelvey says it also makes life… stranger.

Before Square’s success, people talked to him because they wanted to talk to him.

Afterwards?

Some people were really talking to his money.

“People pretend they want to talk to me when they actually want to talk to my money.”

Success introduced a new problem: figuring out which relationships were real.

It forced him to become more guarded — something he never expected when he started building companies.

The Pain That Drives Him

Behind McKelvey’s relentless drive is something deeply personal.

When he was young, his mother died by suicide after struggling with depression.

At the time, he assumed professionals were handling it.

Later, he realized he might have been able to do more.

“I could have done more to save my mother and I didn’t… and I feel that guilt.”

That experience fundamentally changed him.

Now, when he sees a problem he believes matters, he refuses to sit on the sidelines.

Today he’s working on projects like:

• Plastic-free diapers
• Faster drug approvals
• New scientific innovations

Not because they’ll make money.

But because someone has to solve them.

The Advice He’d Give His Younger Self

If McKelvey could leave one message for his younger self, it wouldn’t be a business strategy.

It would be something simpler.

Don’t quit.

Because innovation is messy.

It’s terrifying.

It’s often humiliating.

And it rarely feels cool while you’re doing it.

But the entrepreneurs willing to endure that chaos are the ones who eventually build the future.

The Real Lesson from Square

Square didn’t beat Amazon because it was bigger.

It beat Amazon because it was solving a problem no one else understood deeply enough to solve.

And once you build a true innovation stack, competitors can’t just copy one feature.

They’d have to reinvent the entire system.

That’s the hidden advantage of tackling unsolved problems.

It’s harder.

But it’s also far more defensible.