Plenty of brands are built on one runaway product. It is what they are known for, the product in every ad, the bulk of every month's revenue. From the outside that looks like success. But a business resting on a single product is more fragile than it looks, and the fix is the one most founders keep putting off. The second product.

A hero product gets you on the map. On its own, it caps how far the business can go, because a brand that sells only one thing has given the customer a single reason to buy and no reason to come back.

A hero product has one job

A hero product does one job better than anything else. It wins the customer who has never heard of you. It is the clear, obvious product you are known for, the one that comes to mind when someone thinks of your brand, and that is why it works at the top of the funnel. As our Head of Strategy, Jennifer Courtney, puts it, the hero product solves the awareness stage. It is how a stranger meets you.

The trouble starts when it is also solving every other stage. If the overwhelming majority of your orders are that one product, you have not built a brand. You have built a single product with a logo on it. It is easy to copy, easy to undercut on price, easy to walk away from the moment someone cheaper turns up. You have made yourself a commodity, and commodities compete on price until the margin is gone.

What a returning customer wants next

A customer who bought your hero product and liked it does not want you to sell it to them again. They want to know what is next.

This runs against the instinct to keep pushing the winner. But a happy customer is the most open they will ever be to whatever else you make. They have let you into their life once, and they are inviting you further in. As Jennifer describes it, returning customers keep asking a brand what is next, because they want progression, not repetition. Offer the same product on repeat and you are ignoring the audience most ready to buy again. The second product, and the third, is where a customer stops buying a thing from you and starts buying into you. That is the difference between a product and a brand.

The second product has to be adjacent

Most brands know they need more than one product, so they bolt on whatever is easy. It lands with a thud, because it has nothing to do with why the customer came.

It has to fit the reason someone bought the first. Sell someone a ski jacket and the natural next offer is merino base layers or a good pair of ski socks. It is not a blanket. A blanket is technically in the neighbourhood, cold and soft, but it has nothing to do with why they came to you, which was to be equipped for the mountain. The test is simple. Does this product serve the same person, for the same reason they trusted you the first time? If yes, it deepens the relationship. If it is a stretch, it confuses what you stand for.

Get that right and each product makes the next one easier to sell. The customer who bought the jacket, the socks and the base layer is not shopping your category any more, they are shopping you. That is what you are after, and it is the opposite of competing on price for one product forever.

How to find your second product

Start with your customers. Look at what the people who bought your hero product buy next, and what they ask you for. The gaps they keep working around are your shortlist. Apply the adjacency test to each one: same customer, same reason, a natural next step rather than a leap. Pick the one that clearly belongs beside the hero, build it well, and offer it to the customers who already trust you before you spend a penny acquiring new ones.

Name the metric before you start, so you know if it is working. The simplest is the share of revenue that comes from anything other than the hero. If almost all of it is the one product today, that figure is your scoreboard, and every second-product decision is about moving it. Track it month on month, and watch your repeat purchase rate climb alongside it.

A hero product is a brilliant front door. Just do not mistake the front door for the house. The brands that last give a customer a reason to come back, then a reason after that. Your bestseller got you here. The second product turns the people it won you into a brand worth returning to.

A couple of EcomIQ pieces sit close to this one. You made the sale, Amazon kept the customer is about owning the relationship a repeat customer gives you, which is what a second product is built on. And the welcome flow mistake costing you email revenue covers the emails that earn the second purchase in the first place.

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