> If the idea behind UBI is that people don't need to go work, and won't go buy McDonalds anymore, then tax income is going to plummet.
The idea is that people don't need to go work, because robots do all the work, and thus any economic value attached to labor, either real or nominal, converges to zero. It doesn't matter whether people have financial incentives to do work, because people /do no work/. You don't tax labor income to finance UBI, because nobody will have labor income; all taxes will be on capital of some sort, such as land or securities, and such taxes would be sustainable because all income will accrue to capital and none to labor.
The idea is that people don't need to go work, because robots do all the work, and thus any economic value attached to labor, either real or nominal, converges to zero. It doesn't matter whether people have financial incentives to do work, because people /do no work/. You don't tax labor income to finance UBI, because nobody will have labor income; all taxes will be on capital of some sort, such as land or securities, and such taxes would be sustainable because all income will accrue to capital and none to labor.