* Value is subjective: What's expensive to one person might be cheap to another, especially when dealing with such unique and rare items.
* No universal price list: There's no central database cataloging every vehicle ever created, across all fictional and real worlds. Determining the "most expensive" would require comparing apples and oranges – classic cars, modern hypercars, and even fictional vehicles from space operas.
* "Universe" is too broad: Including fictional vehicles from sci-fi would make the question unanswerable.
You could, however, explore questions like:
* What is the most expensive car ever *sold* at auction? (This has changed over time and depends on the auction house and currency conversions.)
* What is the most expensive car currently *for sale*? (This fluctuates based on market conditions and individual sellers.)
* What is the most expensive production car ever made? (This refers to cars built in a significant quantity, not one-off bespoke creations.)
Focusing on real-world, verifiable sales prices would give you a much more concrete answer.
