So I'm reasonably high earning, and a pretty big chunk of my money already goes on taxes. If you earn around the median wage you actually net negative when it comes to taxes paid vs benefits received. The well-off already pay the majority of taxes.

So say we get AGI in 2024, and companies start laying off people en masse in 2025, and unemployment is steadily increasing.

The people who make the decision on how to manage this are the politicians, and they rely on votes. So the first they will do (in Europe) is probably to put a moratorium on people being laid off because they have been replaced by AI.

Meanwhile unemployment will continue to increase, just a bit more slowly.

As the situation develops and companies complain that they are not being allowed to be as productive as they could be due to regulation (actually a common situation for any safety regulation for example) there will come a need for resolution.

Since 2024 everyone would have been discussion UBI, and the groundswell for this will increase. There will be marches for UBI in the street, and talking heads will raise it constantly on the TV.

So eventually the government agrees to implement a UBI tax on companies based on their revenue and pay a living wage stipend to everyone. Because everyone gets money there would be broad support from the populace.

Companies are allowed to freeze hiring and slowly empty out their offices, but maintain their revenue, and then we have UBI.