Generally, this model is evolved from something tighter niche and targetted towards the consumer audience first. I think AirBNB and early Ebay might be good ca

Generally, this model is evolved from something tighter niche and targetted towards the consumer audience first. I think AirBNB and early Ebay might be good cases to look at? Neither of them really started out the way they are now, they grew into and actually created the marketplace themselves.