Sales bait...

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Are you one of those people who would immediately make a beeline to the shop if you found out there's a promotion for a particular item? Common promotions are like 1) Buy 1 Free 1 2) Buy 2nd Item at 50% off 3) Buy $100 and get $20 rebate 4) Up to 70% off!(I am a fool for this one :p ) Any of you ever ponder after making the purchase if you actually needed the item?