A. 19. When a theater owner considers whether to install another row of seating, she is
thinking at the margin.
b. experiencing a shortage.
underutilizing her resources.
d. using human capital.
c.

thinking at the margin.

Explanation:

The thinking at the margin means to think for the next step that taken forward. Here marginal means extra

Let take an example of the marginal the first lemonade glass quenches your thirst but the next glass would quenches your thirst so much now if you think at the margin so here what would be the next action relevant for you

So as per the given situation, it is a thinking at the margin

(a) when insurance is obtained through a reciprocal insurer, the insureds are sharing the risk of loss with other subscribers of that reciprocal.

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a recipe serves 8 people, and calls for 5 lbs of apples and 2 cups of flour. you want to prepare it for 24 people. divide 24 by 8 to get 3, and then multiply your ingredients by 3.

so for 24 people, you'll need 15 lbs of apples, and 6 cups of flour.