My colleague told us her story on how she and her husband increase GDP by massaging each other.

Husband to wife: I feel a little uncomfortable on my back, could you please have a massage for me?

After the wife had a massage for her husband, the husband kidded: “I can pay you 20 Yuan for each massage!”

Wife to Husband: “ I can pay you 40 Yuan for each massage .”

Husband to Wife: “ Then, how about 100 Yuan for each time! ”

Wife to Husband: “ Any way, it’s still our own money no matter it’s 20, 40 or 100 Yuan. ”

Husband to Wife: “It’s quite different! Our national GDP will increase more if I pay you 100 yuan rather than 20 yuan.”