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AFAIK a lot of classes in the econ dept are curved, and many of them are curved heavily by percentile class performance. you can tell by the fact that letter grade distributions for econ courses (see madgrades.com) are pretty constant, with the top ~15-20% of students getting As, the next 15-20% getting ABs, and so on. if your syllabus doesn't mention anything about this, email your TA and professor about your standing in the class. I can say from experience that doing well in an econ class is all about practice. do lots of practice problems, go to office hours and get every step of the math explained to you.