The admission requirements for master's programs in economics are somewhat similar across schools. You'll need to have a bachelor's degree, but not necessarily a bachelor's in economics. However, if your undergraduate studies didn't include essential courses in economics, finance, statistics, and other related subjects, you may need to take prerequisite classes before taking your core master's courses. These extra courses may impact the total cost of earning the degree.
When you submit your online application, you'll also need to submit transcripts from your undergraduate degree. It's possible that you'll be required to have maintained a GPA of at least 3.0. At some point, you'll probably also be asked for a resume, a personal statement regarding your career goals, letters of recommendation, and possibly GRE scores.