Because we are all the consumer. The point of doing work is to be able to consume other people's work. The total amount of things that can be done is desperate

Because we are all the consumer. The point of doing work is to be able to consume other people's work. The total amount of things that can be done is desperately finite, but the amount that could be done is infinite. If a worker is making pottery by hand, they aren't doing something more valuable with their time.