Little Angel on Earth

Gu Bailu smiled. "It's very simple. The more expensive the food, the rarer it is. It's rare because the yield isn't high. Why is that? Firstly, the natural yield isn't high, and secondly, it isn't easy to obtain. Like bird's nest - you only know how to eat it, but you don't know where it comes from or how complicated it is to clean it.

"When a bird's nest is harvested, it'll have feathers and eggshells in it, and needs to be cleaned. Generally speaking, the person who cleans the bird's nest has to have been trained since childhood. Not everyone can do that. Even the most skilled master takes half a day to clean a bird's nest."

Realization dawned on Ye Huai. "So… as long as you take in the workmen who clean the bird's nests, there won't be anyone to clean them, and it'll naturally be in short supply."

It took half a day to clean a bird's nest!

Who would have thought it would actually be so complicated?