5. Over time, what observation(s) best characterizes how ROE for a given firm should behave? I. ROE will increase, because the firm becomes more efficient II. ROE will decrease, because competition will erode profitability III. The answer depends on how conservative the firm's accounting policies are, which affects its reported earnings. a- I and III b- II and III c- I, II, and III are all possibilities d- None of the above