When considering the determinants of the price-to-book ratio (PB) which of the following is correct? I. All other things being equal, the greater a company's return on common stockholders' equity, the greater the PB ratio. II. All other things being equal, the greater a company's cost of equity, the greater the PB ratio. III. If a company's return on common stockholders' equity equals its cost of equity, the PB ratio should equal 1. IV. The greater a company's current earnings the higher the PB ratio. OI, III, and IV I and III II and IV OI and