If I watch my kids and you watch yours, our contribution to GDP is 0$. If I babysit your kids and you pay me 1.000.000$, and you watch my kids and I pay you 1.000.000$, we just created 2.000.000$ in GDP.
Were we not in abundance the day before but now we are? What changed?
Were we not in abundance the day before but now we are? What changed?