Delta Airlines began offering triple miles to members of its frequent flyer program when they took any Delta flight from New York to Miami. Then United and other airlines immediately matched the offer, and it was believed for a long time that they all must continue the program or lose their competitive position. This situation is an example of:
A. a synergistic effect.
B. a sales promotional trap or spiral.
C. a multilevel sales promotion.
D. a trade-off allowance.
E. the attribution theory in operation.
Answer: B