The two mechanisms I hear about the most

1. AI will be more productive at many tasks by orders of magnitude
2. AI will reduce transactions costs dramatically

The first point directly increases abundance but also indirectly. The freed resources, including labor, are now available to make other stuff.

The second point makes everything more productive, which does the same thing as the first point.

So, other things equal, AI makes life more affordable. That means you don’t need as much of a financial buffer.