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Barbara Corcoran Says These Types of Businesses Are Doomed Before They Start

The Shark Tank star has a short list of ideas she will not touch.

By Chris Lewis, CEPF , Edited by Calista Headrick

Updated Oct. 17, 2026

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Barbara Corcoran has heard thousands of pitches in her 17 seasons on Shark Tank and has put her own money into over 120 businesses. She has also walked away from plenty of ideas that looked good on paper but failed every test she uses to decide whether a business actually has a chance.

The theme running through her warnings is consistent. Businesses without a real competitive moat, or built on structurally declining demand, or that spend before selling, are the fastest way for a founder to burn through capital and close up shop. The rise of remote work has added a new dimension to one category in particular.

Here are the business traps she has specifically warned against.

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Commercial office space plays in major cities

This is the category where Corcoran has been the most blunt. Speaking to Fox Business in 2023, she said commercial real estate was heading for "a bit of a bloodbath before it gets better," echoing Elon Musk's warning that the sector was "melting down fast."

Her diagnosis was specific. "No one really believes it's going to turn the corner," she said. "People are staying home. Our best office buildings in Midtown Manhattan are 50% occupied."

The structural problem she identified has not gone away. Remote and hybrid work arrangements permanently reduced demand for the kind of large, long-term office leases that kept commercial landlords profitable. Companies that took on space assuming workers would return full-time have found themselves trapped in expensive leases with empty floors.

For entrepreneurs looking to build a business around traditional commercial office demand, Corcoran's view is clear: The trend is not temporary, and it is not turning around.

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Businesses that try to automate away the human relationship

Corcoran built her fortune in real estate, a business where trust, personality, and human connection drive the transaction. She is consistently skeptical of ventures that assume you can replace that relationship with software.

She has said that AI is a powerful productivity tool for real estate agents, helping them write listings, manage leads, and coordinate showings more efficiently. But the relationship itself is not something technology can replicate.

Her broader principle extends across industries. High-dollar, high-stakes decisions, whether buying a home, hiring for a critical role, or navigating a complex financial situation, involve human judgment, trust, and accountability that clients are not ready to hand over to an algorithm. Founders who assume the relationship is just friction to be automated away tend to underestimate how much of their product's value lives in the human doing the work.

Easily copied single-product or novelty items

Corcoran has passed on plenty of Shark Tank pitches built around a single clever product with no defensible moat. The pattern she recognizes is that the idea is genuinely fun or useful and shows some early sales traction, but the founder has no real plan for what happens when Amazon or a big-box retailer produces a cheaper version within six months.

She has said the people she invests in are building something around a founder's personality, a brand, or a real and expanding category, not just a single clever item. The product alone is not enough.

A novelty item can produce a viral moment and strong early sales. What it usually cannot do is build a moat. Once the product is visible, larger competitors with existing distribution, manufacturing scale, and lower cost structures can replicate it faster than a small founder can establish brand loyalty. By the time a copycat hits the market, the original founder is often out of runway.

Spending on patents and PR before making a single sale

This is the mistake Corcoran calls out most directly, and it applies to founders across every category.

In a Kiplinger interview, she said: "One of the biggest problems many entrepreneurs have is they spend too much time thinking about the process. They think they have to get a patent first or hire a PR firm right away. What a waste of time."

Her prescription is the opposite approach. "You don't have to get it right, you just have to get it going. All you need to do is get a prototype, walk out there and see if anyone will buy your product."

Founders who spend their early capital on patents, consultants, branding agencies, and PR firms before they have a single paying customer have often done two expensive things simultaneously: They have locked themselves into a specific version of the business before the market has told them whether anyone wants it, and they have burned the money they will need later when the real problems emerge.

Corcoran's view is that the market is the only validation that matters, and you cannot get it by staying inside.

Businesses built by founders who blame rather than adapt

This one is less about the idea and more about the person. But Corcoran says it is one of the most reliable predictors of failure she has seen across more than a decade of post-Shark Tank investing.

In a September 2025 interview with Fortune, she said: "Six months after Shark Tank, something always goes wrong. The supplier didn't deliver, the molds were wrong, an employee messed up. But the minute an entrepreneur starts blaming the next guy, I know it's over and they're going to lose my money."

Things go wrong in every business. What separates the ones that survive is whether the founder treats the problem as a reason to adapt or a reason to explain why it was not their fault. In her experience, founders who look for someone to blame are using the same energy they could be spending on solutions.

What she tells founders to do instead

Her flip side advice is just as consistent as her warnings.

Prove that someone will pay for it before spending money on anything else. Get a prototype in front of a real customer as fast as possible. Corcoran looks for founders who built their idea out of a real problem they lived through themselves, because those people understand the customer deeply and tend to be harder to knock off course.

On marketing, she is a believer in scrappy, creative approaches over paid campaigns. She built her own real estate business largely through press and relationships, and she extends that philosophy to founders: Find ways to get attention that do not require a media budget.

She also looks hard at the person, not just the product. Execution, accountability, and the ability to recover from a setback matter more than the original idea.

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Bottom line

Corcoran's warnings have one thing in common: Some business problems are difficult to overcome from the start. An idea may face too much competition, serve a shrinking market, or require too much money before there is proof customers actually want it. That's why she emphasizes testing an idea quickly and cheaply before investing heavily in launching it.

For entrepreneurs hoping to make extra money instead of pouring cash into a business that may never succeed, Corcoran's advice is simple: Find out whether customers are willing to pay for your product before spending heavily to protect or promote it. If people are willing to buy, you have a much stronger foundation for building the business from there.

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