A scalper is someone who buys things like tickets or products at a low price and then sells them at a higher price to make a profit.
Some people think scalpers are not fair because they make things more expensive for other people.
Examples:
The scalper bought all the tickets and sold them for more money.
I don't like scalpers because they make things too expensive.
The scalper made a lot of money selling the tickets.
The scalper is always trying to make more money.
The scalper bought all the toys and sold them for a lot of money.
The scalper is not very nice because he makes things too expensive.