From Matt Ridley’s blog:-
Take one example: In 1800, a candle providing one hour’s light cost six hours’ work. In the 1880s, the same light from a kerosene lamp took 15 minutes’ work to pay for. In 1950, it was eight seconds. Today, it’s half a second. In these terms, we are 43,200 times better off than in 1800.
There’s one I can think of that’s gone even faster: in 1984 I bought a 32K memory upgrade that cost £30. In today’s money, that’s about £67. You get 12GB of memory for that today. If you’re buying memory, you’re 375,000 times better off that in 1984.