I have a master's degree in economics. I have a Master's degree in Economics.
I am a business student or I am a Business student.
You only capitalize names of sciences and the like when they are the name of a course of study. " The basic rule is use lowercase when you can.
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You only capitalize names of sciences and the like when they are the name of a course of study. So, "I have a master's degree in economics" and "I am a business student", but "I have Economics 101 every Wednesday." The basic rule is use lowercase when you can.