78 Customer Interview Questions to Test your Business Model Canvas Hypotheses 

You get the rights by offering the right value proposition. You're describing a 2-sided market, which is always a challenge. You must have a value proposition for both sides: for the people who will provide you with product (why should they sell through your channel?) and for customers (why should they purchase from your channel as opposed to somewhere else)? Using Amazon as an example, I don't think their core value proposition is cheap physical products. Early on they started by selling books - and those were not discounted that much (early on, Amazon didn't have the market position to demand deep discounts) and customers paid for shipping - which further added to the cost. My guess is that the proposition to book writers was that Amazon could offer incremental sales that would probably not reduce traditional bookstore sales that much (most people bought books at bookstores back then and enjoyed the bookstore ambiance). So that was incremental revenue with little downside - why wouldn't authors take advantage? For consumers, they offered a very convenient shopping experience - buy books without leaving home. They had a good value proposition for both sides of the 2-sided market. So for your 2-sided market idea, what's the value proposition for each side?

@@Startupsos great insight thankyou first of all i didn't believe that my question would be answered because it was so vague..... but this arises another question from my side...like for instance I might have the right proposition value for both sides so how may I reach to the sellers or contact the seller like in appsumo how do they contact these big companies (in their early phase) which are software companies and place their proposals, didn't find this on the internet so I'm asking here Thank you in advance