I just got back from one of my Recruiting Retreats, where I literally lock people in a house for three days and build their businesses with them. One of the things we talked about was working leads...and in fact, we spent a fair bit of time actually having the people in the house dial leads. Most of them had never called leads before...so it was a test for them, a stretch outside of their comfort zone, and a great way to learn.
Sales leads are generated on the basis of demographic criteria such as FICO score (United States), income, age, household income, psychographic, etc. These leads are resold to multiple advertisers. Sales leads are typically followed up through phone calls by the sales force. Sales leads are commonly found in the mortgage, insurance and finance industries.