2026-09-21 · Cross-border
In Cross-Border, the Expensive Thing Isn't Shipping
Most people start the arithmetic with first-leg freight and duty. Both matter, but neither is the expensive part. What actually eats the margin is three other things: platform and ad costs, returns, and cash sitting locked inside inventory and payment cycles.
Start with unit economics, not revenue
A $30 item showing 50% gross margin. Then deduct: marketplace commission 8–15%; advertising at 20–30% of revenue during launch, which isn't an exaggeration but the normal cost of a cold start; then last-mile delivery, returns handling, payment fees and FX leakage. What's left is routinely much thinner than the picture you started with.
Revenue is the easiest number in this business to lie to yourself with. I prefer one question: after an order has gone all the way around, how many dollars actually land in your pocket — and for how long was the cash tied up to produce them.
What kills you isn't slow sales. It's fast ones
That sounds backwards until you've done it. Thirty to forty-five days on the water, another 60 in a warehouse, then the marketplace's payout cycle: cash takes close to half a year to come back around. The better you sell, the more stock you must hold. Growth itself consumes cash.
The harder version is a sudden spike. Selling out means missing the replenishment window, the listing goes out of stock, rank collapses, and every dollar you burned on ads to get there is wasted. To avoid the stockout you air-freight, and one air shipment hands back the margin you accumulated over months. A stockout on a marketplace isn't a few lost days of sales; you lose the ranking too, and climbing back costs more than the freight did.
So my view hasn't changed: product selection decides whether you can start. Replenishment rhythm and cash flow decide whether you're still here in year three.
The tariff you can't see
What actually stops a shipment is rarely the duty rate. It's compliance: how ingredients and labelling must be worded, whether a shelf-life claim is permitted, who holds the certification and who is the responsible party. These items never appear on the cost sheet, and then they detonate all at once — at customs or at listing — and they take the whole batch with them.
Freeze-dried food is a good example. It suits a long chain naturally: light, shelf-stable, high unit value, repeat purchase with a rhythm — which offsets exactly the two things that hurt most in cross-border, freight and spoilage. Its difficulties are equally typical: localising taste, and the boundary of what you're allowed to claim in marketing. The first decides repeat purchase; the second decides whether you're allowed to list at all. Both of those are more of a tariff than freight is.
In the end it isn't about taste in products
After a few years, most people's product judgement converges. The real difference is in two things: the rhythm of cash flow, and the reliability of fulfilment. Neither is exciting and neither fits in a pitch deck, but they decide whether this business lasts three years or three months.