Judging from the purchase behavior of some of my friends, family members, and coworkers, it's apparent that some people are heavily influenced by advertising. I've lost track of the many times in recent weeks that people around me have admitted to being swayed by an ad in a newspaper or magazine, a banner ad on a website, or ubiquitous TV commercials. And it's not as if they feel compelled to purchase things they really need; usually, they already have heaps of whatever it is they're looking to buy stocked in their drawers or closets -- be it cologne, shirts, or shoes. This is precisely why I studied marketing and psychology -- so that I can be impervious to the advertisements we're assailed by daily and immune to the underhanded tactics that salespeople at mobile phone stores, car dealerships, and other places attempt to employ. I recommend that people only let their guard down when it comes to advertisements for products they really need -- the kinds of produc...