> Jevons paradox That depends on the demand elasticity of the thing in question. If everyone already had about all the lights they wanted in their homes (a som

> Jevons paradox That depends on the demand elasticity of the thing in question. If everyone already had about all the lights they wanted in their homes (a somewhat reasonable assumption, give or take a proportion of families turning off lights religiously), making them cheaper wouldn't make you go out and buy more lights -- certainly not enough to make up for the cheaper cost. Stated somewhat differently, when you switched from incandescents to LEDs, did you add more or less than 8x the total lumens to your home? I'm guessing quite a bit less. My apartment is a little small, but I couldn't manage 8x if I doubled the brightness in every room and always left every light on. No lighting efficiency improvements are going to convince me to go beyond that threshold. The point about households on aggregate finding ways to use more electricity doesn't apply because it's not power those houses now have in comparative excess, but rather dollars -- you don't have to buy as much power to do the things you want, so you have more dollars and can choose to spend them on additional electricity consumption or massively inflated rent or a vacation or whatever. The _unit cost_ of electricity (note that Jevons paradox applies to unit costs, not substituted goods or alternative sources of income or savings) didn't change by making lighting more efficient (and, as you've noted, has gotten more expensive), so you're not incentivized more than you already were to spend those dollars on electricity consumption instead of other things you could buy instead.