system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why don't we have solar panels on every roof, building, and vehicle?
gpt
Quite simply: money.

Solar panels are expensive to install and take many years to make back their initial cost. Many new buildings DO include solar panel installations, but to retro-fit them to every building in the country would cost hundreds of billions of dollars. Who's going to pay for that?