I believe markets are not efficient because we do not use some market mechanisms or do not have the right instruments that could make it efficient. We need to improve our understanding of markets.
There are still a lot of inefficiencies we could use. The presence of inefficiency means the presence of opportunities. Profitable opportunities. When we use them it will drive the market to a more efficient state.
I present my ideas of what may be not right or not fit. They are related to arbitrage, market efficiency, derivatives, price models, etc.
If you find some ideas interesting, please feel free to contact me.