because in a society when most of people don't need to work because there is nothing to do for them. you can't compete by working, you can compete by the amount

because in a society when most of people don't need to work because there is nothing to do for them. you can't compete by working, you can compete by the amount of your capital. for example if you use robots to produce X, the only way I can compete with you is having more or better robots (there would be still competition on building better robots as long as people making robots and AIs not AIs generating more AIs). in such a word most of people don't contribute to the economy, allocating resources based on amount of work or capital is going to leave most of society without any resources! free market is still going to be helpful in making AI and Robot owners compete, but they shouldn't be the sole benefactor of robot's work!