Your pricing model should hinge on the fact that the perceived value of services should outweigh the cost associated with it. You can consider looking at online marketplaces like Craiglist, Kijiji, Airbnb, etc to understand various types of business models. However, the approach shouldn't be based on what others are doing. Rather, you should understand your niche, values associated with the niche, and adopt appropriate pricing model.

Invest your time in designing the business model for your startup, followed with reviewing it vis-a-vis other models.

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