Why is the short-run labour demand curve less elastic relative to the long-run labour demand curve? a. Because firms care about changes in wages in the short-run but not in the long-run b. Because firms are better able to substitute capital for labour in the long- run compared to the short-run. c. Because labour is a normal good. d. Because a perfectly competitive firm can always pay lower wages in the long run. e. Because isocost curves get shallower when the wage increases