When the price of most types of products goes up, demand for them tightens. Except for a couple of special cases.

Giffen goods are rare forms of inferior goods ... Another differing type of good is a Veblen good. A Veblen good is an item ...

And they do so for very different reasons. Meet Veblen and Giffen goods, the products that“break the rules”. Normal goods can be further divided into two types: necessity goods and luxury goods.