Hi, could you help me with this question? I don't understand that. You won a free ticket to see a BoysBand concert, a band you like. Only you can use the ticket, you can't sell it to someone else.

Another band, GirlsBand, is performing on the same night and is your next-best alternative activity. You would have to buy a ticket for $40 to see GirlsBand.

On any given day, you would be willing to pay up to $50 to see GirlsBand. Assume there's nothing else of interest going on that night and there are no other costs of seeing either band.

Based on this information, what is the opportunity cost of going to the BoysBand concert?

Thanks,

Yao