Value judgments in economics:

A. can always be avoided with the use of objective analysis.
B. can be avoided through the use of normative economics.
C. are essential parts of positive economics.
D. are necessary when objective analysis cannot address a question.

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The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.