1 smoothie costs 5 salads.

Liz can produce 30 smoothies per hour or 30 salads per hour or any other combination along her PPF in part (a). Liz chooses to produce 15 smoothies and 15 salads per hour.

Joe can produce 6 smoothies per hour or 30 salads per hour or any other combination along his PPF in part (b). Joe chooses to produce 5 smoothies and 5 salads per hour.

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