Because two-sided market apps lack the specificity of on-demand apps, usually more features need to be built. More significantly though, it's much harder for a company to build each side of the market. Uber, for example, is focused on driving. Angie's List, on the other hand, has hundreds of different kinds of service providers. If it wasn't clear from the examples, both on-demand and two-sided marketplaces also have a geographic component. This means that they often start in one area or a subset of areas like Uber did in San Francisco.
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