The market can remain irrational far longer than you can remain solvent. Only price pays; reasons, causes, fundamentals, Elliott Wave counts and technical indicators don’t.
Thank god markets are emotional, how else would we get fantastic over bought and under bought prices. The only trick for the investor is to know when prices are considered to be within a period ‘irrational exuberance’. Some use RSI and Stochastic, others use sentiment readings of confidence, option call put ratios and standard deviations from a long term moving average. Many of these tools have false readings and hence a combination is preferred when forming an opinion and unfortunately that normally end in a confused state of mind for the investor.