Suppose that a small company is thinking of putting plants in their lobby for employees to view and enjoy. Since the plants are to be viewed by employees, the plants are non-excludable (it is infeasible to move a plant each time a specific individual walks by) and non-rival in consumption (if one worker looks at the plant, it does not prevent another from doing so as well).

The company employs three workers: Robin, Tyler, and Karl. The company is thinking about buying up to three plants, and wants to know how much workers would enjoy each plant. For Robin, the first plant has a benefit of$17

$17per day, the second plant has a benefit of$13

$13per day, and the third plant has a benefit of$8

$8per day.

For Tyler, the first plant has a benefit of$12

$12per day, the second has a benefit of$10

$10per day, and the third has a benefit of$6

$6per day.

For Karl, the first plant has a benefit of$8

$8per day, the second has a benefit of$5

$5per day, and the third has a benefit of$2

$2per day.

Given that no one else will see the plants, no one else values the plants in the lobby.

What is the marginal social benefit of the first plant?

$

$

What is the marginal social benefit of the second plant?

$

What is the marginal social benefit of the third plant?

$