As for price sensitivity, highly loyal customers may in fact come to expect a price discount as a reward for their loyalty.

The idea was that it could lend funds to Greece, which would buy back its debt at market prices-ie, at a deep discount to its par value.

Then, once a deal is posted at midnight, they can purchase the coupon, which often provides a 50 percent or greater discount off the face value of the good or service being offered that day.