One thing that hasn't been mentioned is how financing options affect vehicle prices. I don't recall specifics, but in the 1980 I remember financing being limited to 3 years. Five at most. Now there are seven and eight year amortizations available, as well as cheap (per month) leasing options. Since most people base the amount of vehicle they buy on what their monthly payment will be, today's lavish terms automatically bump the amount of vehicle people perceive they can "afford". Manufacturers aren't blind to it.
Using some basic online calculators, I ran the following. The first calcs are on a 1990 vehicle. The second set takes the 1990 payment, adjusts it for inflation, and backs into a current vehicle price.
1990 VEHICLE
$12,500 (about average for a new F150 in 1990)
7% interest
36 month amortization
Monthly payment = $385.96 ($690 in today's dollars)
VEHICLE TODAY
$690 / month (1990 payment adjusted for inflation)
4.99% interest (roughly average for what I'm seeing advertised)
84 month amortization
Amount financed = $49,000
It's no coincidence the vehicle price comes out to about median price for the most popular F150 trim (XLT). Throw in a modest trade-in or small cash down and you're at $57-$60K, exactly the price range you see most often on dealer lots.
Brad