Economics is one of the optional subjects offered by the UPSC in the civil services mains exam. Though not as popular as some other subjects like Public Administration or Geography, Economics has a good success rate among candidates. There have been toppers with this optional also. For instance, in Civil Service Exam 2013 the first rank holder, Gaurav Agrawal had economics as his optional. This article discusses all the aspects you want to know about economics optional for IAS mains exam, Economics is an important part of the UPSC GS papers syllabus as well.