According to Keynesianism, what should happen when the need for
output increases?
A. Unemployment will increase.
B. Tariffs will be eliminated.
C. Hiring of employees should increase.
D. Real output should be at zero.

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explanation:

  this riddles' answer is library.

  the "leaves" are a reference to the books' pages that the library contains; the branches are a network of libraries that connect multiple libraries' collections, resources, and items in a system of a common database, integrating them; the branches' organization are a useful management tool for coordinating the multiple collections many libraries have.

the answer would be c : illustrate that this type of suffering is unimaginable. just took the test