Revenue cost is not the only way to break things down — please don't forget this!
The "Expected AMG Manufaktur usage" is the take rate: what percentage of cars sold in that market will include the Manufaktur customization option. Manufaktur is AMG's bespoke program where customers individually spec paint, interior materials, stitching — at a meaningful price premium.
Revenue: A Manufaktur car earns more per unit than a standard car. The mix of Manufaktur vs. standard directly affects what you earn per car sold — even if total units stay the same. Higher take rate, higher average revenue.
Variable costs: More materials, more customization labor, more finishing time per Manufaktur car. These scale with production volume and product mix. Higher take rate = higher average variable cost per unit.
Fixed costs: The factory, R&D, management, real estate — none of that moves based on how many customers choose Manufaktur. Whether take rate is 5% or 50%, the overhead is the same.
The Manufaktur usage rate is a product mix variable. Product mix variables flow through revenue and variable costs. They don't move fixed costs. That's why.
For more on this kind of case analysis: Ace the Case Interview. And here's a worked video example showing this type of breakdown: Bain + BCG Hot Wheels Case with Video Solution.