The economics of Legoland and the revelation principle

At Legoland, admission is discounted for two-year-olds. But a child must be at least three for most of the fun attractions.

At the ticket window the parents are asked how old the child is. But
at the ride entrance the attendants ask the children directly.

The parents lie. The children tell the truth.

That is again Jeff Ely, from cheeptalk.wordpress.com

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