19. Suppose the DVD player manufacturing industry is perfectly competitive. Under which of the following conditions will the DVD player industry have a downward sloping long run supply curve?

1. As more DVD player firms enter the industry, firms which supply motors find that their per unit production costs rises as their output increases.
2. As more DVD firms enter the industry, firms which supply motors find that their per unit production costs falls as their output increases.
3. As more DVD firms enter the industry, more firms enter the computer printer industry as well.
4. As more DVD firms exit the industry, those firms which supply motors find their per unit production costs falling.
5. As more DVD firms enter the industry, firms which supply motors find their per unit production costs remain unchanged.

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