Reading inventory

The thing that keeps coming back to me is that inventory tends to show up before earnings do. When profits and cash drift apart, the gap is usually sitting on a shelf somewhere.

Buying isn't expensing. This sounds obvious until you watch how often it gets forgotten. A company that builds inventory looks profitable while burning cash; one drawing down inventory looks weaker on the income statement while generating cash. Most of the "profitable companies that ran out of cash" stories probably start here.

The three buckets each tell a different story. Raw materials climbing — could be confidence about a contract, could be fear about supply. Work-in-progress rising — something is stuck somewhere on the floor. Finished goods piling up while sales stay flat is the one I trust least when management offers an explanation, because it's the most likely to be slow-moving demand they haven't fully admitted to themselves.

Turnover only matters in context. A grocer at 6x is in trouble. A jeweler at 6x is fine. What seems to matter more is the trend within a single business. When a retailer's turns drop from 8 to 6, inventory is aging by roughly a third, and that aging usually shows up later as markdowns. The level on its own says less than the direction.

A tension I haven't resolved: lean inventory could be efficiency or fragility, and I don't have a clean test for telling them apart while it's happening. The honest answer is probably that you only really know after a stockout or a supplier shock arrives.

What still seems to hold for me is that inventory is one of the few line items on the balance sheet that reads like a live operational signal rather than an accounting residue. Most of the rest of the balance sheet is photographs of past decisions. Inventory is closer to a pulse.

What I'm less sure of is how much of this is actually predictive versus descriptive. The patterns feel clear in retrospect. Whether they'd have helped me act earlier — I don't know yet.