Consider PV solar: https://ourworldindata.org/grapher/solar-pv-prices-vs-cumula...

In 2003, PV panels were a pretty darn mature technology. The technology was decades old. Modules cost about $5 a watt, one twenty fifth the price they were in 1975. More than two gigawatts of them had been installed worldwide. (Millions of panels!) No way could they fall in price by half, right?

Surprise. By 2010 another 38 gigawatts of solar had been installed, and the price per watt was down to $2.32. No way could they fall in price by half again, right?

Surprise. $1.02 per watt in 2012, and another 61 gigawatts installed. $0.52 a watt in 2017. $0.26 a watt today.

Just in 2022, the world installed 86 times as much solar as existed on the entire planet in 2003.

If you build a lot of something, it can get very cheap indeed.