Negotiators with many social and professional connections are seen as more influential. If you have a large social network, you are more likely to get some good alternatives during negotiations or acquire useful information about your counterpart.
With good contacts you may also increase your visibility, hence improving your status. Even so-called weak ties (social relationships in which there are only infrequent interactions) are also useful because they can easily be activated when required.
You can gain power for negotiating thanks to the following resources.