Distributive approach to negotiation used when the interested parties are attempting to divide something up or distribute something of value, also known as zero-sum approach or win-lose. Commercial situations often demand a distributive bargaining approach, if the 'pie' is inherently of a fixed size. In this case, any conflicts must be resolved by sharing it.
In win-lose approach, a negotiator wants to maximise the value obtained in a single deal, the relationship with the other party is not important. Therefore, a strong party may win more than 50% of the metaphorical 'pie'.
It should not be assumed that win-win can be applied to all commercial negotiations, or that win-lose approaches are inherently inferior.