Well, this seems a new way to make money, but whether any such company has a condition that they can only advertise for one company, if not than no of dollar can be made just by making contract with no of companies.

In such a hyper turbulent environment, success of any model is quite difficult. As their is so many challenges and constraints that very few are dealing with them on realistic grounds.
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Car advertisement seems a great one for both the advertiser and the car holder, as it fetches him with 100 dollar per month.