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Of course you can. The 5 field of specialization is just a guide of what you can do for your research, in fact there are more area in economics to be explored. Department of Economics has lecturers which specialize in particular field of expertise. For instance, you can do research on health economics, labor economics, crime economics, microeconomics, behavior economics. The maximum capacity is 60 students per class, but the average is just around 30 students per class. Behavioural and experimental economics, energy economics, and many more.