Concert Ticket Market Set the price. Watch the line, the empty seats and the resellers.

The arena on show night: a seat map shows sold and empty seats, fans who could not get tickets wait in line, and a reseller appears when there is a shortage.
A supply and demand graph: price on the vertical axis, number of tickets on the horizontal axis. The demand line slopes down, the seat supply is a vertical line, and a draggable horizontal line marks your price.
Fans who want in
Seats
Ticket revenue

Drag the gold price line on the graph, or use the slider.