One Ingredient

I was at the drug store the other day and needed to purchase one item. The brand name cost $11.96 for 48 pills. The store brand cost $4.96 for the same 48 pills. The store brand was out of stock but there was another alternative. A brand named "Quality" cost $3.56 for 48 pills. I picked up the box and read the ingredients. There was only one ingredient and it was the same as the other two brands. I stood there holding both boxes, deciding if I wanted to buy the unknown brand. Then I thought to myself "it is only one ingredient". How could I go wrong with one ingredient? I bought the $3.56 box and realized how powerful advertising and a brand name can be.