The Marketplace increases tax revenue allocated to the treasury by 50%. It also increases the number of happy faces produced by luxuries: * 1 luxury = 1 happy face * 2 luxuries = 2 happy faces * 3 luxuries = 4 happy faces * 4 luxuries = 6 happy faces * 5 luxuries = 9 happy faces * 6 luxuries = 12 happy faces * 7 luxuries = 16 happy faces * 8 luxuries = 20 happy faces