Two economists see a pile of poop on the road. 💩

A says:
If you eat it, I’ll give you $100.
B thinks for a moment, then actually eats it and receives $100.
The two continue walking and see another pile. 💩
This time, B says:
You eat it, and I’ll give you $100.
A thinks for a moment and also eats it. 🍴
After walking for a while, the two suddenly stop.
A says:
Wait, it seems our money hasn’t increased.
B says:
Yes, but we each ate a pile of poop.
A nods and says:
But we just created $200 worth of GDP. 🐕