Independent variables are the variables that affect the dependent variables
Dependent variables are what is being affected and measured
Say someone was doing a study about how sleep affects productivity
Independent example: how little sleep or how much sleep the participants get
Dependent example: productivity of participants
Answer:
My guess is that it means that lower taxes and less government generate a better economy. Nevertheless, most Americans benefit from a well-financed public sector of the economy paid for by high taxes on rich people and corporations. This is what we get when Democrats dominate the government.
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I think your answer would be according to some things you wrote on your question, income taxes.