> Do you have any numbers for this?

Strange you'd really push back on this part. Do you now own multiple washing machines at home because they're more efficient? Seems like a pretty obvious take to me but ok let's go.

Looking at census statistics of durable goods it was in the 80s over 25 years ago.

https://www2.census.gov/programs-surveys/well-being/tables/1...

Nearly 20 years later it was still in the 80s.

https://www.prnewswire.com/news-releases/us-census-bureau-da...

Doesn't seem like there's much room to go up from here unless people are going to start owning multiple for some reason.

Meanwhile they became a lot more energy and water efficient.

> In 2000, 87% of all clothes washers consumed at least 600 kWh/yr. By 2019, 85.4% consumed fewer than 200 kWh/yr.

> The average annual unit energy consumption (UEC) of clothes washers decreased 83.9% between 2000 and 2019

https://oee.nrcan.gc.ca/publications/statistics/aham/2019/wa...

For many things the initial or operating costs aren't what's constraining the market for the product. Clothes washers could be cut in half in cost tomorrow but it's not like I'm now rushing out to go buy twice as many. They could go to only require 5 Whr's to run a load but I'm still going to have about as much laundry. We've pretty much tapped out that market in developed countries, the only really new thing was all in one units becoming more economical to a few percent more of the market that didn't have the plumbing or space availability before.

If we were all too stupid to think of new uses for the steam engine we wouldn't have massively increased their usage by making them cheaper to build and cheaper to operate. We'd have just saved more money and used a bit less coal to do the same things we were doing before. If there isn't a market for the things that steam engine enabled, it doesn't end up becoming Jevons Paradox.

Looking at the Jevons Paradox with spreadsheets and accounting, it wasn't just that the spreadsheet made accounting work so much faster and easier, it's that then the effective output per cost per hour for an accountant dropped massively enabling people to hire part time accountants en masse that increased the demand for accountants. If businesses that never would have bothered for accountants didn't come in and effectively revolutionize what it meant to be an accountant all it would have done was making it cheaper for the same firms to do the same work with fewer people.