Two economists are walking down a forest path and they come across a piece of animal excrement. The first economist turns to the second and says "I'll give you $100 to eat that!" The second one eats it and the first one gives him $100. They start walking again and a few minutes later they come to another piece of animal excrement. The second economist now looks at the first and says "I'll give you $100 to eat!" The first one eats it and collects his money.
They walk a bit more and the first one says, "You know, I gave you $100 to eat shit, and you gave me the same $100 to eat shit. I can't help but think we both just ate shit for nothing." The second one responds, "That's not true at all! We increased the GDP by $200!"
It's not an argument, it's a joke. And the crux of why it's not a real argument is if you're willing to do Job X for $N, there is basically no scenario in which you're also willing to pay $N out of your own pocket for someone else to do Job X.
They walk a bit more and the first one says, "You know, I gave you $100 to eat shit, and you gave me the same $100 to eat shit. I can't help but think we both just ate shit for nothing." The second one responds, "That's not true at all! We increased the GDP by $200!"