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How to Evaluate a Startup

I am working on my company for over a year and half. My company is an innovative Online business that is going to provide a service that has never been provided before. and at this point we have developed the concept and are working on the Demo product. But we need to find some investors.
My Question is How can you Evaluate a Company that does not have a product yet and haven't had any Revenue?. I mean how can u put a Value when there hasn't been any money coming in and there is no product ready to sell?
Thank you

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