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I call these 3 models of selling goods or services, "selling techniques", because they give these ways are very effective depending on which one suits your organization and I see sometimes you can use two or all, they are really good techniques to earn money, in the service I can offer I see the second model working for me and I am most likely to try it out - offer for free to all the beneficiaries but sell add ons. Thank you team for these piece of information, it's really helpful.