Unless I'm mistaken, the relationship between supply and demand is still a well regarded concept in economics - if the supply of labor doubles, the cost of labor will...

A) Be unaffected

B) Increase

C) Decrease

I'm not saying there is a fixed amount of work, I'm making a supply and demand argument to argue that the cost of labor will fall when the supply increases. Thus, I think my analysis isn't committing this fallacy, but if be happy to consider your reasoning if you care to explain.