The lecturer kept repeating this line during the first Economics lecture....

Never let good opportunities go to waste. You know, when you make choices in life, you will have to forego certain things, which in incur opportunity cost. An opportunity cost is the next best alternative foregone. See, when theres scarcity, choices have to be made and something has to be sacrificed....

Unlimited wants, limited resources. Think about it. Are some things even worth sacrificing? Weigh the pros and cons and you will figure out yourself.

So, don't cause wastage if you can! Some resources are not sufficient to go around...