Inventory Basics: How Small Sellers Avoid Stockouts and Dead Stock
Inventory kills small stores from two directions at once. Run out of your best seller and you lose sales today and search ranking for weeks — algorithms demote listings that go dark, and the recovery is slow. Order too much of the wrong thing and your cash sits in a warehouse turning into storage fees. Most sellers manage this by feel. Feel works until the first real growth spurt, and then it fails all at once.
The only formula you need: the reorder point
Forget software for a moment. Inventory control for a small catalog is one line of arithmetic per product:
Reorder point = (daily sales × lead time in days) + safety stock
Worked example. Your water bottle sells 6 a day on average. Your supplier plus sea freight takes 40 days door to door. Your safety stock — cushion for a sales spike or a shipping delay — is, say, 15 days of sales, so 90 units. Reorder point: 6 × 40 + 90 = 330 units. The day stock touches 330, you order. Not when it "feels low." The formula exists precisely because "feels low" always fires three weeks late for a product with a 40-day pipeline.
Recompute the daily-sales number monthly (use the last 30–60 days), and fatten safety stock before Q4 or a planned promotion. That's the entire system for a store under fifty products: a spreadsheet with four columns and a weekly five-minute check.
Why stockouts cost more than the missed sales
The direct loss is obvious. The indirect loss is worse: marketplaces rank on sales velocity, and a listing that stops selling loses position it doesn't automatically get back on restock. Sellers routinely report a two-to-six-week climb to recover rank after an outage. If a stockout becomes unavoidable anyway, slow the bleeding: raise the price 10–20% to stretch remaining units, pause the ads pointing at the listing, and never let the listing show "unavailable" if your platform lets you take backorders honestly instead.
Dead stock: the quiet failure
The opposite disease has no alarm bell. A product that sells one unit a week while 400 sit in storage isn't inventory — it's frozen cash paying rent. Quarterly, run one report: units in stock ÷ monthly sales = months of stock on hand. Anything over six months gets a decision, not a hope:
- Push it — bundle it with a best seller, feature it in email, cut the price meaningfully (not 10%; 30–40% moves things)
- Liquidate it — clearance channels, lot sales, even donation. Recovering 40 cents on the dollar now usually beats 60 cents of storage fees later
- And stop reordering it — the most violated rule in small-store inventory. Dead stock almost always got dead by being reordered on autopilot
Order sizes: smaller and more often, until it hurts
Bigger orders get better unit prices, and every beginner over-weights this. The unit discount on a 5,000-piece order is visible on the invoice; the cost of being wrong about 5,000 pieces is not. While a product's demand is still proving itself, pay the worse unit price on 300–500 units and buy information with the difference. Scale order sizes only after three or four reorder cycles agree with each other. The factory will still be there.
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