Inventory & cash flow: never sold out, never crushed

• Monthly fee per cubic meter: manageable with healthy turnover — but it rises sharply in Q4 (Amazon prices its scarce Christmas space). Q4 is selling time, not storing time.
• Aged-inventory surcharges: they kick in at 181 days of shelf time (clothing, shoes, bags, jewelry and watches only from 271 days), are billed monthly at a mid-month snapshot and climb steeply with age — the 12-month-plus tiers were raised sharply again in 2026. Rule: from half a year of shelf time, almost any clearance price beats continued storage.
• IPI score: Amazon's grade for your inventory health (excess stock, sell-through, out-of-stock rate, stranded listings). A weak IPI can cap your storage capacity — letting you store less exactly when you want to grow. The levers are this lesson's: don't over-order, don't sell out, fix stranded listings weekly.

• 1. Lower the price (moderately) and raise ads deliberately — more velocity on existing demand; even a break-even clearance beats aged-inventory fees.
• 2. Coupons/deals: lightning deals and coupons accelerate without permanently damaging the list price.
• 3. Amazon Outlet/clearance recommendations for deep discounts with visibility.
• 4. Removal or liquidation: pulling stock back (or liquidating) as the last step — painful, but a defined cost instead of a monthly growing one.
• And always: note the cause. Overstock is almost never bad luck but an over-optimistic order — the lesson belongs in your ordering playbook.

Your money runs a cycle: deposit → balance payment → freight/duty → weeks on the shelf → Amazon payout (14-day rhythm). Between the first euro out and the first euro in lie 3–4 months — and the reorder is due BEFORE the first order has paid itself off. Practical consequences:

• Keep a simple 13-week cash forecast: planned payments (supplier, freight, taxes, ads) against expected payouts. A spreadsheet suffices — what matters is seeing the squeeze four weeks before it arrives.
• Reinvestment reality: in year one, profit mostly stays locked in inventory. That's not failure, it's growth — but only if you planned for it.
• Outside capital (credit line, merchant financing, Amazon lending) can accelerate growth — always price the interest against the margin of the additional goods, never “by feel”.

Advanced sellers steer purchasing not by unit margin but by the annual return on capital tied up in inventory: the product's yearly profit divided by the average purchase capital sitting in stock. This metric exposes what the volume discount really costs: it improves profit per unit marginally — and doubles the tied-up capital in exchange.

The math on the AURELO set (8 sales/day ≈ 2,920/year; assumptions: €5 unit profit after all fees, 0.003 m³ per set, about €26 monthly storage per cubic meter outside Q4):

The discount nets about €350 more profit — but ties up an extra €2,835 of capital on average. Those additional euros earn just over 12 % a year, while every euro in the lean variant earns over 400 %. And the aged-inventory risk is not even priced in yet: at 3,000 units, the second half sits past day 181 by the math — exactly the surcharge zone from this lesson, possibly through expensive Q4 on top.

• Decision rule 1: evaluate every tier price as a return on the ADDITIONAL capital tied up — never as savings per unit. Below roughly 30–40 % annual return (rule of thumb), the alternative almost always wins: put the capital into faster replenishment rotation or the second product.
• Decision rule 2 — the coverage cap: order quantities beyond about 180 days of coverage push goods into the aged zone from day 181 by design. A discount meant to compensate must cover capital costs, extra storage AND a risk premium for clearance pressure — a few percentage points rarely manage that.
• Growth flips the math: at 20 % monthly growth, the same quantity's coverage shrinks dramatically — then the same discount can suddenly be attractive. Calculate with the expected sales rate, as with the reorder point.