When a firm is subject to external diseconomies of scale and decreasing returns to scale, in what way would these be represented on a cost curve diagram?
- Ashift in long-run average cost curve: downward; movement along long-run average cost curve: downward
- Bshift in long-run average cost curve: downward; movement along long-run average cost curve: upward
- Cshift in long-run average cost curve: upward; movement along long-run average cost curve: downward
- Dshift in long-run average cost curve: upward; movement along long-run average cost curve: upward