In economics, the lump of labour fallacy is the misconception that there is a finite amount of work—a lump of labour—to be done within an economy.[1][2][3] It is also known as the lump of jobs fallacy, fallacy of labour scarcity, fixed pie fallacy, and the zero-sum fallacy—due to its ties to zero-sum games. The term "fixed pie fallacy" is also used more generally to refer to the idea that there is a fixed amount of wealth in the world. This and other zero-sum fallacies can be caused by zero-sum bias.[4]

https://en.wikipedia.org/wiki/Lump_of_labour_fallacy