Once upon a time: there were two Economists, who were on a morning walk. And, they saw a pile of shit.
1st one said to 2nd: "If you eat this shit", I will pay you 5000Rs, thinking he will never take this bet. But, the 2nd one ate it.
They walked further: they saw a pile of shit again. This time the 2nd one said to the 1st one: since you lost 5000. I will give you a chance to cover your losses.
"Eat this pile of shit, I will pay you 5000Rs".
Now, the 1st one ate it.
Both of them continued to walk. And, one explained to the other: "Wait a minute: GDP went up by 10,000. But, we made 0 money. And, both ate shit!"