Testing a variety of promotional attempts will tell you what will bring in the bacon and how much money and effort it will cost. Promotions dangled whereby they initiate the actions are 2-5 times more fruitful in generating sales income than when you have to mail or telemarket. However - if the total income derived from yellow page ads, radio spots, newspaper, TV or electronic billboards isn't measuring up to the needed or desired level of income to make you happy (or to keep your people working), then more aggressive actions must be employed. It's called, "you-go-to-them."
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