Can we use the GasBuddy model to create efficient economies for other industries?

I just finished reading "Content Nation" and it is a nice book that summarises a lot of what we know. I particularly like the rules that encapsulates the spirit of what each section is about. One such rule states that:

Empowering anyone to understand supply and demand builds efficient economies that benefit the most people

This is a thoughtful statement and the example given is GasBuddy, which is a website that enables users to learn about gas prices in US and Canada. It is a simple and powerful illustration of the kind of information that reveals demand and supply. Umair Haque talks about creating more markets. Revealing demand and supply is the perquisite to doing so.

Now, which industries do you think is in desparate need for a GasBuddy equvialent? On top of my head: Health Care services, Legal Services, Photography, Financial Products, Medicial drugs etc.

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