The road thing is usually tied to “induced demand” (which is a bad way of looking at it imo). Jevrons is more directly related to the cost of something dropping increasing the usage because new things that weren’t worthwhile are now doable - related, but more directly tied to things like “smartphones are cheaper now so more people have them”.

You do hit limits eventually (most people get to one smartphone and stop except for replacements) but the surprising paradox is when you don’t even see the possible demand (think: worldwide market for maybe six computers type things) - you have to think of something and then think of what would happen if it was (effectively) cheap as free.

Water in the USA might be an example, it went from something difficult and valuable and precious to we flush our toilets with drinking water - unthinkable wealth to parts of the world even today.

If a smartphone was fifty cents what new uses could be found? If the small shell script that replaces you is now $19 for anyone to develop, what happens?