Your agent markets your property to other real estate agents and the public. In most markets, over 50% of real estate sales are cooperative sales; that is, a real estate agent other than yours brings in the buyer. Your agent acts as the marketing coordinator, disbursing information about your property to other real estate agents through a Multiple Listing Service or other cooperative marketing networks, holding open houses and tours for other agents, etc.This initial agreement is only the beginning of a process of appraisals, inspections and financing -- a lot of possible pitfalls. Your agent can help you write a legally binding, win-win agreement that will be more likely to make it through the process.