$13-4.($Dividend policy and stock prices$)$ The issue as to whether dividend policy has an effect on share prices raises a question as to whether dividends paid out to stockholders are any more $$certain$$ than the expected future dividends the stockholders hope to receive from retention of firm earnings. This is known as the bird$-$in$-$the$-$hand theory of dividend policy. Do you agree with this theory? Explain.