I looked at one specific model (a Corolla) There's a patently false assumption here: that a "specific" model is comparable across a 7-year span. What happened

I looked at one specific model (a Corolla) There's a patently false assumption here: that a "specific" model is comparable across a 7-year span. What happened to the price if you normalized on, say, curb weight? With expensive items like airbags, air conditioning, and high-end audio, a car is more like a "basket" than a single item.