There are just so many people trying to make you buy things! Advertising is the worst, of couse not just on TV but also while waiting for a bus, in magazines, in shops. It is difficult to ignore it.
To help me not buy anything unnecessary I asked myself, Do I need this? Do I really want this? Will my life be better if I buy this? Of course, the answer was always no. I didn't have to buy anything, really. I could always do without.