State whether the following statements are true or false, and explain your answer if you judge the statement to be false (a statement must always be true to be considered true).

i) In an efficient market all investments should have the same long-run average return

ii) In an efficient market all investors should have the same long-run average return

iii) Stocks exhibiting positive or negative abnormal returns indicates market inefficiency

iv) Evidence of irrational behavior on the part of some investors proves that efficient market hypothesis is false