Would you like to buy some tulips?

I also have some stamps to sell. A real example of collectible that has fallen in value outside few very rare and perfect specimen.

The funny thing is: tulip bulbs were actually a productive asset. You could plant the bulbs to create more of them.

Apparently they're also semi-edible.

https://www.poison.org/articles/tulip-bulb-toxicity-191

This is precisely why financially literate people hold on to the amount of cash necessary to buy and sell goods, keep some excess in an account that bears interest, and the bulk of the rest goes into productive assets.