How do intermediaries affect the price of a good ?

Of course you can find a perfect answer under title (channel management in several reference as Jober,2012) , but there are a several ways that they can affect the price of the good:1- you may take them in consideration while you are pricing the product, to ensure their profit.2- at market demand and their stock levels, could really affect the price of a certain goods.3- distribution strategy itself, especially if it is intensive strategy, where you sell to whomever has the cash.4- Number of intermediaries and their levels, where some lower level could sneak to a higher level if he has a special order..... these are several scenarios and cases to the answer, which could result  setbacks. that is why you need to set objective then rules and contracts and constantly monitor them and strengthen your relationship with you network for a better control