You're right on the money with your estimate. The equivalent to buying that $18,000 Prelude in 2020 dollars is $40,500. And your average $40,000 car these days is going to have significantly more equipment and safety features than anything from 1988. Just as an example, $40,075 today will get you a 2020 Mustang GT with a 460HP 5.0, 6 speed manual, Intelligent Access, LED lighting, Dual Zone climate system, SYNC 3, Satellite Radio, 4 Piston brake calipers, ambient lighting, and a safety list a mile long of airbags, Adaptive Cruise Control, Auto high beams, rain sensing wipers, etc. All features that were reserved for very expensive vehicles or not available at all back then. It's amazing how far and how fast the industry has advanced.