>After some digging it turned out that in the last 10 years the price of cars went double. Literally double. Same car, like Fiat Panda, with the same engine and configuration, that ten years was worth one potato is now worth exactly two potato.

You communicated the concept perfectly. Anyone holding onto a pile of say 10k cash in 2015 have exactly 5k cash value in 2025. But here's a hidden kicker. Storing any functional vehicle in cheap storage is turning out to be a sold form of investing.