The robots are creating the wealth. Once you get to a certain points (where robots can repair and maintain other robots) you no longer have any need for money.
What happens to the economy depends on who controls the robots. In "techno-feudalism", that would be the select few who get to live the post-scarcity future. The rest of humanity becomes economically redundant and is basically left to starve.
Well assuming a significant population you still need money as an efficient means of dividing up limited resources. You just might not need jobs and the market might not sell much of anything produced by humans.
What happens to the economy depends on who controls the robots. In "techno-feudalism", that would be the select few who get to live the post-scarcity future. The rest of humanity becomes economically redundant and is basically left to starve.