3-4. Consider a firm for which production depends on two normal inputs, labor and capi- tal, with prices w and r, respectively. Initially, the firm faces market prices of w = 6 and r = 4. These prices then shift to w = 4 and r = 2. (a) In which direction will the substitution effect change the firm's employment and capital stock? (b) In which direction will the scale effect change the firm's employment and capi- tal stock? (c) Can we say conclusively whether the firm will use more or less labor? More or less capital