Have you attended a concert lately?  Unless it was for a community orchestra, or your child's school concert, odds are fairly high you purchased your tickets through Ticketmaster.  And you might have wondered why the ticket cost several dollars more than the listed price.  All because of added costs like "convenience" charges.  And you might have wondered why you are paying a convenience charge for tickets you bought online and printed out yourself, or even for tickets that are "paperless" and required no printing.  David Kestenbaum and Adam Davidson tried to make sense of the Ticketmaster setup on Planet Money.  Take a listen or download the podcast here.