How Do I Know Whether My Business Idea Is Good?

The difference between an idea and a business

Many people have ideas that sound great in conversation but fail as businesses. An idea is just a hypothesis about how the world could be better; a business is a repeatable system for creating and capturing value. A good idea only becomes a good business if there is a group of people who feel the pain of the problem enough to reach for their wallet.

To move from an idea to a business, you must move from 'wouldn't it be nice if...' to 'how much is this costing them right now?'. Commercial viability is not about how clever the solution is, but about the economics of the transaction. If it costs you £100 to acquire a customer who only pays you £50 over their lifetime, it is a bad business, no matter how good the idea sounds.

The Evans 'What Business Should I Start?' tool (/what-business-should-i-start) helps filter ideas by these commercial realities before you commit significant time or capital.

Does the problem pass the 'Aspirin vs. Vitamin' test?

A 'vitamin' idea is one that makes things slightly better or offers a long-term, non-urgent benefit. An 'aspirin' idea solves an immediate, acute pain. In the early stages of a business, you want to be an aspirin. It is much easier to sell a solution to a problem that is keeping someone awake at night than one that is merely a nice-to-have.

Ask yourself: what is the consequence of the customer *not* buying your solution? If the consequence is minor frustration, it's a vitamin. If the consequence is lost revenue, regulatory fines, or operational shutdown, it's an aspirin. Focus your energy on ideas that solve urgent problems with clear negative consequences if left unaddressed.

Evaluating the 'Unit Economics' of the idea

You don't need a 50-page business plan, but you do need to understand the basic maths of your idea. Illustratively, if you plan to sell a service for £500, how much will it cost you to deliver? Consider your time, materials, software, and the cost of finding the customer. If the margin is too thin, the business will be fragile and leave no room for error or growth.

A good idea has healthy margins that allow for reinvestment and a fair return on your time. If the only way the idea works is if everything goes perfectly and you work for free, it is not a good business idea. It is a job you have created for yourself with no benefits and high risk.

The 'Right to Win': Why you, and why now?

A good idea is often specific to the founder. Do you have the skills, contacts, or technical knowledge to execute this better than someone else? If anyone could start this business tomorrow with a small amount of capital, you have no 'moat' to protect your margins. A good idea leverages your specific background to create a competitive advantage.

Timing is also critical. Why is now the right time for this idea? Is there a new regulation, a shift in technology, or a change in customer behaviour that makes this more viable than it was two years ago? Being too early is the same as being wrong; being too late means competing with established giants. Look for the 'window of opportunity'.

How to test the idea for under £500

The best way to know if an idea is good is to try and sell it. You don't need a finished product or a full brand to do this. A simple landing page, a few direct outreach emails, or a small test advert can provide more data than months of research. The goal is to find the 'cheapest possible failure'.

If you can't get anyone to even click on an ad or respond to an email about the problem, the idea likely needs to be refined or abandoned. This early validation is the most important step in protecting your working capital. Don't build the solution until you have proof that the problem is real and people want it solved.

Evans Business Builder focuses heavily on this validation phase, ensuring that capital is only deployed once there is commercial evidence of demand.

Signs that an idea might be a 'bad' one

Be wary of ideas that rely on changing people's fundamental habits, ideas that require a 'critical mass' of users before they are useful, or ideas where the decision-maker and the person who benefits are different people with conflicting incentives. Also, be honest about 'me-too' ideas where your only plan is to be slightly cheaper than the market leader.

If your primary reason for the idea is 'I would use it', be careful. You are a sample size of one. You need to find a significant group of other people who also have the problem and are willing to pay to solve it. A good idea is validated by the market, not by your own enthusiasm.