Answer:
Marginal product is the additional output produces when one more unit of labour is employed. In our case, when Elmo hires a second worker, his marginal product is 7.
Hyperbole
If don't know what it means its best to start of with what you do know
Process if elimination.
It's not a simile because it has no like or as.
Its not Personification cause its not giving the object human features.
And its not metaphor cause its not literally Applicable. I'm assuming.
So that just leaves you with hyperbole.
In 1920, American voters elected a President who promised <u>to increase the U.S. role in world affairs.</u>
Because he enjoyed writing about romance