Why "follow your passion" is bad advice
It's not bad because passion doesn't matter. It does. Building a small business is hard enough that you'll need genuine interest in the work to survive the boring weeks. It's bad because passion is necessary and not sufficient. Plenty of people are passionate about ideas the market won't pay for, or pays so little for that the business can't sustain a living wage. A better starting point is the overlap between three things: what you can do well, what people will pay for and what you can deliver at a margin that works.
If passion is the only criterion, you end up with the kind of business that makes a lovely Instagram account and a slow path to financial trouble. The four-criterion filter below is designed to keep passion in the picture without letting it overrule the maths.
The four criteria
Score each idea you're considering on these four. Out of five for each. Out of twenty in total. Anything below twelve is probably not worth starting. Anything above sixteen deserves a real test.
Demand
Are people already trying to solve this problem? Are they searching for solutions, asking in forums, complaining about the existing options? Demand is much cheaper to find than to create. A business that meets existing demand only needs to be a credible alternative. A business that has to create demand from scratch needs to teach the customer first, and that's expensive.
Quick checks: search the problem on Google and see how many businesses already exist. Look at the eBook of monthly searches on a free tool. Check the busiest local Facebook groups for the question being asked. Look at competitor reviews to see what people are buying. The more visible signals there are, the higher the score.
Margin
Will the price you can realistically charge cover your costs and leave enough to live on? This is where most romantic business ideas quietly fail. A handmade soap that costs four pounds to make and sells for six leaves two pounds for everything else - your time, the marketing, the website, the rent, the tax. Two pounds doesn't add up to a livelihood.
Run the simplest possible version of the maths. Realistic price, realistic costs, realistic number of sales per month. If the answer is uncomfortable, score this low. Better to find out now than after you've quit the day job.
Skill fit
Can you already do enough of the work to start? You don't need to be the best in the country. You need to be good enough that an early customer would happily pay you and recommend you. If the idea requires a skill you'd need to learn from scratch, the timeline stretches by years. That's not a reason not to do it eventually. It's a reason to be honest about what "starting" means in this case.
A useful test: imagine your first customer asked you to deliver the work next week. Could you? If yes, score high. If you'd need to subcontract every part of it, score low.
Findability of the first ten
Where do the first ten customers actually come from? Not the millionth customer. The first ten, this season, with no track record. If the answer is a credible specific list - "three letting agents I've already met, two builders who refer me work, one Facebook group I'm an active member of" - score high. If the answer is "I'll work it out once I've launched," score low.
This single criterion separates ideas that survive year one from ideas that quietly fade. Most failed first businesses didn't fail at the work. They failed at finding the first ten customers.
- Demand: 0 = no visible problem, 5 = clear ongoing demand with active searchers
- Margin: 0 = barely covers costs, 5 = realistic price gives a living wage at modest volume
- Skill fit: 0 = would need to learn from scratch, 5 = could deliver to a paying customer next week
- Findability: 0 = no idea where the first ten come from, 5 = a named list of plausible sources
Three ideas, three honest scores
Let's run three real shapes through the filter so it stops being abstract.
Idea one: a solo bookkeeping practice for tradespeople
Demand: 4. Self-employed tradespeople constantly complain about tax season. Margin: 4. A monthly retainer of seventy to a hundred and fifty pounds per client across forty clients gives a workable income with low overhead. Skill fit: 5. The owner has done bookkeeping inside a firm for eight years. Findability: 4. There are three local trade associations and two builders' merchants happy to recommend a trusted bookkeeper. Total: 17. Worth a real test.
Idea two: a sourdough baker selling at a Saturday market
Demand: 3. Sourdough has a market but it's competitive in most cities. Margin: 2. Loaves cost two to three pounds to make once everything is counted, sell for six to seven, and the volume needed for a living wage is large. Skill fit: 4. The owner has been baking seriously for two years. Findability: 4. A local market with steady footfall is a good first channel. Total: 13. Borderline. Worth running the maths very carefully before committing to any equipment.
Idea three: a freelance brand consultant for early-stage tech founders
Demand: 3. Real but crowded and very location-sensitive. Margin: 5. Day rates are high if you can win the work. Skill fit: 3. The owner has worked in branding for three years but has never sold to founders directly. Findability: 1. No existing relationships in the founder world, no obvious way to find the first ten. Total: 12. The score is held back by findability, which is the single most fixable problem on the list. Either commit to building those relationships before launching, or pick a customer the owner can actually reach.
What the scorecard is trying to tell you
The point of the scorecard isn't to produce a winner. It's to surface the weak spot. Almost every idea has one criterion that drags the score down. Margin in the bakery. Findability in the brand consultancy. The honest answer is usually one of three things. Adjust the idea to fix the weak spot. Pick a different idea where the weak spot doesn't exist. Or accept the weak spot and build a plan to address it before you launch.
A recurring principle: prove demand before spending heavily
The next chapter is entirely about cheap ways to test demand before you commit money. The reason it earns a whole chapter is that demand is the single weakest assumption in most new businesses. Owners get excited about an idea, score it generously, sink savings into a website, premises or stock and only then discover that the customers they imagined either don't exist or don't behave the way they expected. Spending heavily before testing demand is the most expensive mistake a new owner can make.
The earlier eBook What is Go-to-Market? lays out why this principle sits at the heart of the whole series. The next chapter is the practical version of it: the smallest possible tests that tell you whether real strangers will hand over real money.
What to do this week
Pick your top three ideas. Score each one honestly against the four criteria. Pick the one with the best score and write down the single riskiest assumption in it. Usually it's either "people will pay this price" or "I can find the first ten customers through this channel." That assumption is what you're going to test cheaply in the next chapter, before you spend a penny on anything else.
In the next chapter we'll go through the handful of cheap demand tests that will save you the cost of finding out the hard way.
