Hi. The top universities for economics are ruled out if you don't have maths all the way to A2. However, you can apply for some good economics courses that are in ranked outside the top 10. These courses do not generally require economics as a prerequisit, and actually business wouldn't be particularly helpful, unless you are very interested in business in the context of economics. Otherwise a biology a level might even be considered better as a traditional course. To do maths at AS level, would also be advantageous for most good economics courses, even if you don't have it all the way to a2.