How many times you need something and get it from your seniors? You may be looking to buy a used laptop. Also you may be interested in selling a book for a negotiable price since you no longer need it. Tom may be interested in teaching VB.Net as a personal tutor locally. It is all about finding something within community.
 
At LISTS you create your classified posts. It can be a request for other members or it could be an offer to others for a price.
 
Members search or browse the classified posts based on their needs. They can collect interested items or services in a cart. Even questions can be asked to the classified post owner. Members can coordinate the deal mutually.
 
LISTS facilitates demand and supply within the community! It is another way to benefit mutually.