Information asymmetry isn't a market failure, it causes market failures. The second sentence of the article you linked explains that. I'm sure reading further y

Information asymmetry isn't a market failure, it causes market failures. The second sentence of the article you linked explains that. I'm sure reading further you'll find more information on the topic. The same goes for lack of competition. There also aren't many kinds of market failures. The market fails when goods aren't efficiently allocated, this and only this is a market failure. May I suggest you learn about economics 101 before trying to discuss it?