It's really long, and it's essentially an essay version of your resume. Try and consider it more of a liaison between your resume and the job you want - specifically, why does all that experience on your resume mean you'll be good at the job you're applying for?

for example:

I seek to utilize both my economics education and work experience.

How will you utilize it?

I am a highly motivated individual, and I feel that my past experiences attest to this.

This is perfect, and really all that you need to say about that - your resume will contain the specifics about where you went to school what you studied etc. The resume and cover letter should compliment each other.

Make it clear what job you're applying for and why you're the best fit.

Also, drop the "in conclusion," from the first sentence of your last paragraph, it's redundant.