What are the implications of the EMH for financial decisions? What is behavioral finance? What do the new ideas in this area tell us about the stock market?

What is the efficient markets hypothesis (EMH)?
What are the differences among the three forms of the EMH: (1) weak
form, (2) semistrong form, and (3) strong form?
What are the implications of the EMH for financial decisions?
What is behavioral finance? What do the new ideas in this area tell
us about the stock market?