Hi Danieh - I would also recommend taking the calculus class if you have the time. Here are some reasons why:
1) MORE PERSONALIZED ATTENTION - Taking the class in high school, means that your class size is more limited and the teacher is giving you more personalized attention through the course (especially compared to college where depending on your major it may be required). And, you likely know the others taking the course in high school to help you through any problem areas.
2) GREAT FOR HIGH SCHOOL TRANSCRIPT - Taking a challenging course like calculus would look great on your high school transcript, especially if you are going for a major in economics/finance. And transcripts are one of the key documents that colleges look at in reviewing your application. It will demonstrates to colleges your level of commitment, your critical thinking skills, and other great attributes. BUT, make sure that you have the time to put in the work for a good grade!
3) HELPS PREPARE YOU FOR COLLEGE CLASSES - Like some other answers have noted, calculus is often one of the harder courses required with many majors that can be used to weed people out (and depending on the college, may have hundreds of people in them). Taking it in high school will make taking the course (or any course that uses the knowledge/skill) in college much easier.
4) POTENTIAL COLLEGE CREDIT - If you decide to take the AP/IB test for college credit, you may not even need to take the course in college. I took Calculus AB in high school, passed the AP test, and the only math I needed to take in college (as a Finance/Marketing major) was one business statistics course.
I think you'll do great regardless of what you decide to do! The only other advice/warning I have is to maintain (or increase) the level of difficulty in your senior year. I was taking all challenging courses my junior year and then took two "easier" courses my senior year of high school (one being a standard level business course). But, I ended up getting waitlisted at a university because they said it looked like I wasn't challenging myself anymore. Hopefully this helps! Good luck!