Your DMS reports tell you floor-plan interest and depreciation. They do not tell you the thing that actually bleeds the store: the opportunity cost of the bay.
Which is why dealers keep aged inventory too long and do not know why the math is wrong.
The DMS-report version of aged inventory
Standard report. Floor-plan interest on a $35,000 unit at 7.5% is about $218 a month. Depreciation in the used market averages 1.5–3% a month for a normal unit. Call it $700 a month between the two. The DMS flags the unit as aged at 45 or 60 days and recommends repricing.
That is the calculation every dealer sees. And every dealer accepts it, reprices down $300, and moves on.
The math is wrong by an order of magnitude.
The opportunity-cost version
Your lot has a fixed physical capacity. Call it 140 units. Your monthly sales pace is, say, 95 units. Your inventory turn is roughly 1.5 times per month on the average unit.
An aged unit occupying a bay is not just costing you its floor-plan and depreciation. It is displacing a turn. If that bay held a normal-aging unit, it would have sold and been replaced 2–3 times in the window the aged unit has been sitting there.
Assume a front gross of $1,800 on a normal unit. Assume the aged unit has been sitting for 90 days. The displaced-turn cost is approximately:
2 missed turns × $1,800 front gross = $3,600
Plus the $2,100 in floor-plan + depreciation your DMS was reporting. Total: $5,700. Not $700.
The aged unit is not costing you 25 dollars a day. It is costing you 65 dollars a day in economic terms.
Why the DMS does not catch it
Because the DMS is a ledger. A ledger records transactions. Opportunity cost is a non-transaction — the turn that did not happen. You have to model it. You have to compare the bay to a counterfactual normal-aging unit.
No DMS does this. Louie does it because Louie is not a ledger; Louie is a decision layer.
What the action is
Two things change once you compute the real cost.
First, repricing happens sooner and more aggressively. A $500 drop at day 30 is dramatically better than a $1,200 drop at day 90. The $500 drop saves $5,700. The $1,200 drop forfeits it.
Most dealers do the arithmetic the wrong direction. They hold on to the price, hoping for a retail deal, because the DMS-reported cost of aging is small enough to rationalize. When they finally drop, they drop big — after the damage is already done.
Second, the wholesale-vs-retail decision becomes sharper. Some aged units are not going to retail at any reasonable price. The faster you can get a wholesale channel open on them, the less opportunity cost you bleed.
Louie has the wholesale network mapped per zip code, and flags units that are structurally better wholesaled than retailed based on the pattern of how similar units have sold in the market the last 90 days.
The systemic effect
Across the operator's 5-rooftop deployment, aged-inventory cost-avoidance runs roughly $32,000 per rooftop per year compared to the prior DMS-only workflow. That is not a small number. That is a full-time employee paid for, from one change in how a dealer thinks about inventory.
Put 960 rooftops through the same workflow under an acquirer's distribution, and that number is $30 million a year of aggregate dealer-side savings. Some of that is capturable as pricing headroom on the product. All of it is value the acquirer's book generates on top of whatever their core DMS provides.
The DMS ledger cannot get there from here. The decision layer can.