Know Your Worth
The story goes something like this... Before dying and elderly person told their child: This is your grandfather's watch and is a couple of hundred years old. But before I give it to you, please go to the watch shop and see how much they will offer you.
The child went, and then came back, and said the watchmaker offered 6 dollars because it's old.
The old person said: go to the coffee shop.
He went and then came back, and said: they offered 3 dollars.
The old man said: Go to the museum and show that watch.