The diagram illustrates the long-run average cost curves (LRAC) for a firm. Which pair of movements correctly describes each type of economy or diseconomy of scale?
- Ainternal economies of scale: W to Y; internal diseconomies of scale: X to W; external economies of scale: Z to W
- Binternal economies of scale: W to Y; internal diseconomies of scale: Y to W; external economies of scale: Z to W
- Cinternal economies of scale: X to Y; internal diseconomies of scale: W to Z; external economies of scale: W to Y
- Dinternal economies of scale: X to Y; internal diseconomies of scale: Y to X; external economies of scale: W to Y