Why Is Everyone Suddenly Selling the Same Thing?

You know the pattern. A product you had never heard of is abruptly in every feed, every marketplace, every ad. Six months later it is either a commodity with no margin left in it, or it is gone.

The usual explanation is that shoppers discovered it. Most of the time that is backwards.

Search "trending products 2026" and you will get ten thousand near-identical lists, most of them written by companies that would like to fulfil your orders. They all answer the same question: what is trending. Almost none of them answer the more useful one: why this, and why now.

That question has an answer, and from where we sit — in Guangdong, on the phone to factories — it is usually upstream of the shopper. Something changed in a factory before anything changed in a feed.

There are three ways that happens. They look identical from the outside and they reward completely different behaviour, which is why this is worth twenty minutes of your attention before you buy into a hot category.

It got cheap

The mechanism: an input cost collapses, the product crosses a price threshold, and it stops being a considered purchase and becomes an impulse.

Batteries are the cleanest example anybody has. LFP is lithium-iron-phosphate, the cheaper cell chemistry that now dominates storage, and its packs average $81/kWh against $128 for the older nickel-manganese-cobalt chemistry. Lithium-ion pack prices overall have fallen to around $108/kWh, according to BloombergNEF. In China the average fell 13% to $84/kWh, and the cheapest cells anyone observed went for $36/kWh.

Now watch what that does downstream. A portable power station used to be serious outdoor-gear money. By August 2026 a German supermarket chain was selling a 2.24kWh plug-in battery for €299. Not a specialist retailer. A supermarket, next to the groceries.

Nobody woke up that year suddenly wanting a home battery. The battery got cheap enough that wanting one became a reasonable thing to do.

The catch, and it is a big one: this is not a one-way street. Battery-grade lithium carbonate went from around US$8/kg in May 2025 to more than US$25/kg a year later — a rise of over 200%, which we checked against the underlying figures — as energy-storage demand collided with tightening supply (Investing News Network). Cost collapses reverse, and sometimes violently. If your entire margin depends on an input staying cheap, you are not running a business — you are holding a position.

That distinction between a durable advantage and a temporary one is the same thing that separates the sourcing models in what you actually pay under each sourcing model.

(Battery figures as of September 2026 — check them before you rely on them.)

It got scarce

The mechanism: the same logic running backwards. Demand outruns supply, the price climbs, and the category becomes visible because of the scarcity rather than despite it.

Matcha is the story of the year. The Global Japanese Tea Association describes 2026 as the first genuine matcha shortage in the history of Japan's tea trade. Tencha is the shade-grown, de-stemmed leaf that becomes ceremonial matcha, and it reached about ¥10,843/kg at auction, roughly double the previous year. In Kagoshima it averaged around ¥13,910/kg, up 2.3 times.

What makes it stick is agricultural. A new tea field takes about five years to reach full production. You cannot retool a hillside the way you retool a production line, so the supply response is measured in growing seasons rather than quarters.

What scarcity actually does to a category is invite fakes. When genuine supply cannot meet demand and the price has doubled, the gap gets filled with something, such as blends sold as single-origin, lower grades relabelled, or non-Japanese leaf sold under famous regional names. That is not a matcha quirk. It is what every real shortage does, in every category.

So if you are buying into a scarcity trend, your risk is not margin compression. It is that what arrives is not what you bought — the same problem as working out whether the supplier is a real factory, with higher stakes and more incentive for everyone to fudge it.

It got easy

The first two mechanisms announce themselves in the price — one drives it down, the other drives it up. This one is silent, which is why it catches people out.

Capability spread is what happens when a manufacturing technique stops being a specialism and becomes ordinary. No dramatic price crash, no shortage — just a capability that everybody suddenly has. It is the least visible of the three and probably the most common.

Press-on nails, for example, went from obviously-fake to genuinely good — not because one company had a breakthrough, but because tooling, adhesives and finishing improved across an entire industry at once. The category did not get invented. It got competent.

This mechanism is running unusually hot right now, for a reason that has nothing to do with any individual product: China's manufacturing base currently has considerably more capacity than it has orders. Factory-gate prices for consumer durables are falling at their fastest pace since 2009, export prices are down more than 20%, and the country is three years into deflation.

In practical terms, there is a great deal of capable capacity looking for work. That is why a category can go from three credible suppliers to three hundred inside a year, and why the first quote you get on almost anything right now looks so good. Aggressive quotes are also, reliably, the ones that move later — which is most of why a quote changes between sample and order.

What each kind of trend means if you are the one buying

Here is the whole thing in one table. The useful part is noticing that the word "trending" is doing no work at all — three products can all be trending while the correct move is different in each case.

How to tell which one you are looking at

Three checks, none of which require a supplier relationship or a budget.

Price direction over the last twelve months. Falling means a cost collapse. Rising means scarcity. Flat but increasingly crowded means the capability has spread. This is the single fastest signal available and it costs nothing.

Listing similarity. Pull up a dozen sellers and compare the product photography. If the images are identical, they are all buying from the same factory and reselling it. You are in a capability-spread category, and there is no moat in it until you build one yourself.

Sample friction. Easy samples — fast, cheap, no drama — mean mature capacity. Sudden talk of allocation, minimums creeping upward, unexplained delays: that is constrained supply, whatever the seller says on the call.

One timing note that applies to all three. Whichever kind of trend you are in, the calendar is indifferent to your strategy — a move that lands in the wrong month runs straight into the Chinese New Year shutdown. Plenty of the categories we have actually run were won or lost on timing every bit as much as on selection.

Where this does not apply

Being straight about the limits, because supply-side thinking explains a lot and not everything.

• Some trends genuinely are demand-side. A film, a celebrity, a format that happens to work on one platform. Nothing changed in any factory; something changed in culture. Collectible blind-box toys are far more this than the reverse.
• Brand-led categories ignore all of it. Where the brand is the product, unit cost is close to irrelevant and none of the three mechanisms tell you anything useful.
• Real categories overlap. The clean three-way split is a teaching device. Most live categories are two of them at once, and the interesting ones are all three.
• None of this predicts anything. It explains what is happening now and what that implies for your position. Anyone confidently telling you what will trend next year is selling something, quite possibly a fulfilment service.

What a China-side partner changes

If you have chased a trend before, you know the shape of the disappointment: by the time a category is obviously hot, the margin is already gone. The lag is rarely discovery. It is confirmation — the weeks between suspecting something is moving and being sure enough to commit money.

The mechanism is proximity, not prescience. Being on this side means the signals arrive earlier and cheaper: which factories are suddenly quoting a category they did not make last year, where lead times are stretching, which lines are being retooled, whose minimums just dropped because a big order fell through. None of that is secret. It is just visible from here and invisible from a laptop in another hemisphere.

The second thing it changes is the cost of being wrong. Testing a category properly means samples from several factories, and doing that from outside is slow and expensive enough that most buyers test one supplier and call it research. Running several in parallel is ordinary if someone is already in the city — the same logic behind consolidating everything one business runs on into a single relationship.

Where this does not win. If you already have a factory you trust in the category you want, this adds a layer you do not need. If you are buying one product in meaningful volume and the relationship is working, stay put. And nobody can help you with a trend that has already fully commoditised — at that point the honest advice is to pick a different category rather than pay someone to find you a slightly better price in a dead one.

If it is useful, here is who we are and how we work with our factories. Or tell us what you are looking at and we will tell you which of the three it is — that part is free.