MONEY (USD) by Nahuel Olivera - Trick

The magician holds an envelope in his hand and tells his audience that he has a bill inside and that this will serve as his prediction. He announces that this bill is only one among the seven existing possibilities ($1, $2, $5, $10, $20, $50 and $100). A spectator freely selects one of these seven denominations. The magician opens the envelope for all to see. Incredibly, inside is the exact bill that the spectator freely selected!!!