Product-market fit signals a small business can see in its own records

Customers are polite. Ask a buyer whether they like your product and they say yes. Ask them to buy again, or to give your number to a friend, and you learn what they think. Product-market fit is the state where enough of the right buyers do those things without being pushed. A small business can check it with three searches in its own records. They are the invoice book, the phone, and the log of requests. If the signs are weak, more advertising buys more of the same weakness.

Search one: the invoice book, sorted by who rang whom

Take the last year of invoices and put each customer in one of three groups.

• Came back on their own, with no reminder from you.
• Came back only after you phoned, visited or sent a message.
• Ordered once and never again.

Only the first group is a sign of fit. The second shows that your effort, not the product, creates the repeat, and effort can be a perfectly good business. It is simply not the same thing.

Before you count, ask how often a satisfied buyer should return. A consumable has a natural cycle. A bridal set does not. If you sell something bought once in ten years, drop this search and lean on the next. Also leave out customers whose first order is too recent to have had time to repeat.

Search two: the phone, for who sent whom

Scroll back through the last ten new customers and ask how each heard of you. Mark each as asked or unasked. If you offered a commission, a discount or a nudge, it was asked. If an old buyer simply passed your number to a friend, it was unasked.

Unasked referrals matter because the referrer spends their own credibility, and people may not do that for something merely acceptable. A referral from a relative, a partner's contact or a supplier who gains from your sales is weaker. Count it, but mark it. Once you have referrals, moving from referrals to a repeatable pipeline is the next step.

Search three: the requests you did not sell

Owners tend to skip this search, because the information lives in scattered chats.

Keep a running note of every message asking for something you do not offer: a smaller size, another colour, delivery to a town you do not reach, a bill in another format. Three or four buyers asking for the same thing is worth acting on. One buyer asking is a quote, not a market.

These requests show that buyers are trying to fit you into their working life. The opposite is also informative. If nobody asks you for anything, the product may sit so far from their needs that they have not bothered.

Imagine: a coir doormat maker in Alappuzha

Imagine, as an invented example, a coir workshop in Alappuzha that makes doormats and sells to home-furnishing dealers in Kochi and Chennai, mostly through WhatsApp. The owner feels sales are "good but tiring" and is thinking of a showroom. The figures are illustrative.

The owner sorts last year's invoices. Of 28 dealers who bought, 8 reordered unprompted, 10 reordered after a phone call, and 10 bought once. The second group had been counted as loyal customers, which made the picture rosier than the evidence.

The phone showed that of the last seven new dealers, five came through a Kochi dealer who gave out the number without being asked. Two came through an exhibition the workshop had paid for.

The requests were the sharpest. Four dealers had asked, separately, for a smaller doormat size "for apartments". The owner did not open the showroom, and made the smaller size for those four to see whether they reordered it without a call. Two did; two did not answer. Fit, if it existed, lay in a narrow group of dealers and one size. The showroom was a guess.

How strong is strong enough?

There is no clean line, so treat these as a rule of thumb.

If most of the buyers who have had time to reorder do so unprompted, and unasked referrals turn up regularly, you have fit for that group. Spend on finding more like them. If reorders come mostly after chasing and every referral was asked for, you have a product people tolerate. Narrow the offer before you spend. If most buyers bought once, phone five of them and ask what happened. Do not ask whether they were satisfied: ask what they used it for and what they did next.

Fit also belongs to a segment, so run the three searches again for each kind of buyer you serve. It may hold for dealers and not for homes, or in one city and not another.

Cases where the signs mislead

A single large customer who reorders can hide the fact that everyone else left. A festival product reorders in seasons, so measure across a full year. A business that has discounted heavily will see repeat orders that follow the price. And a small group, say eight customers, cannot show a rate. It shows a pattern to check.

For something you have not yet sold, a cheap test beats any search of records; see how to test demand for a new product before you buy stock.

Sort the invoices this week

Write the three group counts on a sticky note and put it where your partner sees it. Do search one first, since it takes an afternoon and costs nothing.

What you find should shape your marketing: aim it at the group that comes back unprompted. Product-market fit and demand validation is the service for testing a doubtful segment, and for help reading your counts, tell us what you need.