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I'm unsure what you mean by "I will be able to have more control...by doing extra coursework." Coursework is not particularly what bogs you down. You have 2 years of coursework that is on a set schedule, generally (1st year core, 2nd year field classes). Once you take more upper level math (analysis, probability theory and the like), you'll have a better idea of the rigor required for PhD classes, and therefore the infeasibility of "rushing" the classwork stage of your PhD. The next 3 years are for your dissertation. There is no real excuse for trying to rush your dissertation; the quality of your dissertation (and therefore your job market paper) is what gets you a job, so rushing this stage would not benefit you in the long run. Out of curiosity, what is your ultimate goal after getting your econ PhD? Do you want to go into academics, government, NGO?