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Why do you need to know their buying habits? You are selling goods and services right? If you are selling or offering something, you should have a working knowledge as to how much and how often your target will buy such goods or services you will offer. massage therapy, photography, day care, making gift cards and baskets, interior design, bookkeeping and many more. Lots of people think that making money online is a "quick fix". It just remains for you to choose the best one for you