All else being equal, your best chance at getting into UChicago is through ED.
What makes you fit into the crowd at UChicago? What is it about your application that would make you stand out? If you have good answers to these two questions, then that will show in your essays… and it will show in your recommendations if your letter writers know that you are a real good fit.
Your grades are on the margins… but I am trying a slightly different take on your grades. It seems like the B’s are from 1st and 2nd year. Is there a good story to explain that? How did you get from getting Bs to getting As in your latter years? If so, that might make for a great essay, if not use a supplemental essay to explain that.
SATs, extracurriculars are strong enough and they allude to a potentially interesting essay about yourself and why UChicago.
Anyway, If I am putting a finger in the air and making a guess, your changes are about 30%-40%, if your essays are superb (did your English writing skills improve… I see it’s one of the classes where you have a B?) then you may push it up to above 50%, and that is really where you want to position yourself because…
If you want to go into Econ (even though you’re not really applying to a major) your cohort, based on academic interest will be very competitive.
And…
I infer that you are Asian (apologies if I am wrong), and although you wont be treated like how you will be negatively treated if you were to apply to Harvard with its alleged de facto quota of Asian students (if the news were to be believed) your demographic cohort is also highly competitive.
So to answer your question:
The pragmatic answer would be: check out Georgetown or Vanderbilt to increase your chances at ED’ing to a school that you like and will likely give you equivalent opportunities after graduation.
The optimistic answer would be: if you are really set on UChicago (which means your essays will be awesome…yes you will know right away if they are awesome) and you just know you would not be happy if you did not even try (having already written that awesome essay), then swing for the fences! As they say, if you don’t apply, your chance of getting in is zero
(Just make sure you have a solid safety, otherwise your results will be suboptimal)
Good luck!