How to test demand for a new product before you buy stock

A supplier has offered you a new product at a good price if you take 500 pieces, and three friends have said it looks great. That is the moment to test, because praise is free and stock is not. Fix a stop rule in writing. Put the product on a one-page offer with a price, take pre-orders or written commitments from real buyers, and make about ten calls to people who should want it. The money you save is the stock you do not buy for a product nobody asked for.

Step 1: write the stop rule before you begin

Do this first, because after a few kind replies you will want to carry on whatever the numbers say. On a sheet, write three lines:

• The number of pre-orders, or signed intentions, that covers my minimum production or purchase quantity: ____.
• The date by which I need them: ____.
• If I fall below ____ (half of the first number), I will stop or change the offer.

Between the two numbers lies a "change it" zone. If you land there, change one thing, such as the price, the pack size or the buyer, and run the test again. Do not change three things at once, or you will not know which one mattered.

Step 2: build the one-page offer

The page can be a simple web page, a PDF or a WhatsApp catalogue card. It holds six things: a clear picture or drawing, what it does in one sentence, who it is for, the price, the dispatch date, and how to order. Show the minimum order if there is one.

Write the price on the page. A product shown without a price teaches you only who is curious. A priced offer teaches you who will pay.

Step 3: take pre-orders, not likes

A pre-order means money or a signed commitment before the stock exists. Say so on the page and say what happens if you do not go ahead: for example, a full refund within a stated period. Rules about advance payments and refunds differ, so ask your adviser what applies to you.

Where full payment feels too much, ask for a small advance or a written purchase intention from trade buyers. Count these separately. An advance from a stranger counts as one unit of proof. A "send me details" counts as none.

A pre-order message you can send as it stands:

We are planning a [product] for [buyer]. Price [amount], minimum [quantity], dispatch [date] if we reach [number] orders. Pay [advance] now to reserve yours; if we do not go ahead, your money is returned in full. Reply YES with the quantity you want.

Do not say "limited stock" when there is no stock.

Step 4: make ten calls

Pick ten people who match your buyer. Do not ask "would you buy this?", because many people say yes to be polite. Ask what they use now, what annoys them about it, what they paid last time, and what would make them change. Then show the offer and ask which part they would change. Write down their words. For more ways to gather evidence, see market research methods small businesses can use. Once the product is proven, the go-to-market checklist picks up from there.

A tally sheet for the test

Compare the total of the first two rows with your stop rule. The other two rows tell you why you landed where you did.

An invented example: a lunch-box maker in Nashik

This maker is made up, and so are the numbers. A small steel-utensil maker in Nashik thought of a leak-proof stainless lunch box with a compartment for hot dal, aimed at office workers. A full run of dies and stock would cost more than the owner could afford to lose. The stop rule: 300 boxes ordered, which covers one batch, within five weeks.

The owner put up a one-page offer with a drawing and a price, sent it to office canteens, tiffin services and two corporate gifting agents, and made ten calls. The calls showed that office workers liked the idea, but the buyers who would order in volume, the gifting agents, wanted a printed logo, which had not been planned. The first round reached 190 boxes, short of 300 but above the half-way mark of 150, so it fell in the change-it zone.

The mistake was the buyer, not the box. The owner re-ran the offer to gifting agents only, with logo printing on the page and a larger minimum. Written commitments reached 340, and the dies were cut. Two of the three agents had pushed for a lower price than the one on the page, so the margin came out thinner than the first sums had shown.

A price test before you commit

If you are unsure of the price, do not rely on buyers naming one; the figure they give can be low. Put two versions of the offer in front of two similar groups of buyers, with prices a clear step apart, and count orders in each. Keep everything else the same. If the higher price gets about as many orders, you have found margin. If orders collapse, you have found the edge.

Reading a result that is not clear

If the test lands in the middle, with a few orders, several maybes and one strong buyer who wants something different, do not read it as a yes. Ask that buyer to describe exactly what they want, and test it as a second offer on its own page, against the same stop rule.

When not to test this way

Skip a pre-order test if the product is a safety or regulated item, where selling before it is approved may be a problem; check with the regulator or your adviser. It also does not suit very cheap, impulse goods, and it will not tell you about repeat demand.

If you want someone to work through these questions with you, see product-market fit and demand validation. For the wider planning around a launch, start at the marketing hub.

Write the three lines today

Take a sheet, write the three lines of the stop rule, and set a date. Build the offer page after that, not before. If you want to talk through a product you are unsure about, tell us what you need.