Why do we listen to others?

I definately think the statement, "It's a shame that the people who are listening to you the most are only interested in you because they want you and your peers to buy their product" is true today. It's sad, but this statement is definitely valid. People today listen to others usually for their own personal gain. They are looking for something to get out of it that will help them, and they usually don't just listen to listen. I think this definitely shows in advertising companies. They listen to what consumers say so they know what works and what doesn't. They need to know which of their marketing techniques lure consumers to buy their products so they can ultimately use them to make more money. This is also shown in other aspects of life, such as when teenagers only listen to their parents before they tell them they want money for something or that they broke their cell phone and need a new one. We interact with others for a personal gain, not just to be nice.