WASHINGTON--(BUSINESS WIRE)--The following press release was issued by Merchants Payments Coalition: Sales are expected to jump 4 percent this holiday season, which means tidings of joy for retailers and the entire economy during a crucial time of the year. But, as always, the banks will be there to deflate the holiday cheer. That’s because banks help themselves to as much as 4 percent of the purchase price when customers swipe a credit card to buy a turkey or a television or a tie for Dad. Tha