US mobile phone subscriptions per 100 people

Here is a thing that happened: between 2005 and 2022, Americans acquired mobile phones at nearly the exact rate that solar panels became affordable, as though the universe had decided to balance our addiction to wireless connectivity against our guilt about the power grid. One went up, the other came down, with the kind of synchronized inevitability usually reserved for cosmic jokes we're not clever enough to understand. We were simply moving phones into our pockets while moving the cost of renewable energy out of the realm of fantasy.

What we're probably watching here is the long shadow of Moore's Law and manufacturing scale colliding with the same decade of economic development. As China became the workshop of the world, it manufactured both the smartphones that connected 330 million Americans and the solar panels that made renewable energy technically plausible. The mobile phone subscriptions rose from about 69 per 100 people in 2005 to 128 by 2022, while solar panel costs fell from roughly $4 per watt to under $1—a shift so dramatic it's like watching the cost of electricity literally halve while everyone around you gets a second phone. The real correlation might be that both are symptoms of the same phenomenon: global manufacturing efficiency improving at such velocity that previously impossible or absurdly expensive technologies became mundane almost without our noticing.

So we have stumbled upon a pair of statistics that move together not because phones make solar cheaper or vice versa, but because they're both passengers on the same economic vehicle hurtling through the early 21st century. This should make us either more confident about technological progress or more suspicious of our ability to detect genuine causation, and we are genuinely unsure which. The data correlates beautifully. Reality remains opaque.