19In order to assess whether the existence of several beer supply agreements impedes access to the market as so defined, it is further necessary to examine the nature and extent of those agreements in their totality, comprising all similar contracts tying a large number of points of sale to several national producers (judgment in Case 43/69Bilger v feble [1970] ECR 127). The effect of those networks of contracts on access to the market depends specifically on the number of outlets thus tied to national producers in relation to the number of public houses which are not so tied, the duration of the commitments entered into, the quantities of beer to which those commitments relate, and on the proportion between those quantities and the quantities sold by free distributors.