柠檬问题发生的原因是卖家比买家更了解产品，从而导致市场失灵。

"Memory is a strange thing. It doesn't work like I thought it did. We are so used to thinking of it as a camera or a tape recorder, but it's not like that at all. It's more like a painter. It creates a picture, but it's not always the same picture."

Great design is about solving problems, not just making things look good.

The meaning of "knowing" has shifted from being able to remember and repeat information to being able to find and use it.