Even though many ballparks practice price discrimination between adults and children in selling tickets, such discrimination is not applied at the concession stands because

Price discrimination occurs when the same goods or services are charged by a company at different customer prices. Many types of price discrimination are illegal such as charging more for women's haircuts than men's haircuts. To be legal, it is necessary to justify the different prices charged to another group by the amount of effort required.

In that case, even if ballparks charge different prices for children than for adults, it is not often done at the concession stands because children can purchase cheaper tickets that later could be used by adults.

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