I find these assumptions curious. How so? What is the AGI going to do that captures markets? Even if it can take over all desk work, then what? Who is going to

I find these assumptions curious. How so? What is the AGI going to do that captures markets? Even if it can take over all desk work, then what? Who is going to consume that? And further more (and perhaps more importantly), with it putting everyone out of work, who is going to pay for it?