What items are sought more in a buy and sell trading?

hmmmmmmmmm how about beauty products? I have no basis for this in fact i'm just making a wild guess, but beauty products seem to be in demand and highly sought for everywhere i go... i know a lot of people who are putting up websites to sell their beauty products and judging the way they talk about it, i think they're doing pretty good in selling them, so maybe beauty products are one of things that are easily sold because of the high demand or the many people who are interested in buying these things.... i think these things have become a necessity especially for girls.