My wife is an economist and I am an engineer.

I was watching my wife make her breakfast one morning, and noticed that she made way too many trips to get each of the items she needed. So I said in my best engineer voice, “Hey sweetheart, why don’t you utilize the load maximization principle and carry all the items you need in one trip, thereby minimizing total distance travelled?”

Well don’t you know, she loved my suggestion!

It used to take her 11 minutes to make her breakfast… now I do it in 5.