Providing a product or service for free can circumvent other marketing efforts and help the customer immediately grasp your product, Lee Polevoi writes. Games using the "freemium" model -- free to play, pay to advance -- set up a "norm of reciprocation" psychological mode that builds customer loyalty. Consider giving away software or an application, whitepapers or e-books, promotional items or free consultations. "The best freebie is one that costs you little or nothing to produce but delivers measurable results," Polevoi writes.

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