You may purchase a body polish cream that costs several hundred yuan, just because the sales lady tells you that it can make your legs smooth and delicate immediately. A wrinkle-removal cream set which is rumored to be able to travel through time may cost more than your telephone bill of one month. "But many times, you are paying for the sellers, which include market promotion fees and product packaging fees. Expensive doesn't mean high quality." This is the view in many MBA teaching cases.