Original post by MindMax2000Have you checked the entry requirements for the specific degrees that ou are interested in doing?
To go into economics, you only need A Level Maths. Some of the top end universities might ask for Further Maths as well. Economics A Level is not needed at all.
To get onto a business course, you generally just need 3 A Levels in any subjects. The only possible exception is in finance, financial engineering, or actuarial science where you would need A Level Maths.
Personal bias: you don't need a business degree to get into a job in business, so I would avoid it where possible. You can do professional qualifications to give you the same credibility as a degree, except for going into academic research in business.
If for any random reason you want to do a business degree irrespective, you can always do a master's in business with an undergrad in any subject. If you want something in finance, you would either need a quantiative undergrad or something related to economics and finance. If you want a postgrad in economics, you would need an undergrad in economics (or at least a joint degree in the subject).
Economics as an A Level is very theoretical and you would be referring to a lot of models. However, you will struggle to find any maths beyond KS2 in the A Level (as far as I know).
Business is a bit more practical (and it's a good basis for foundational business knwoledge if you want to start your own business), but still the concepts can be a bit academic. There is next to no maths involved (accounting and accounting ratios require knowledge of arithmetic). Having said that, it's not stictly speaking considered as an academic subject, but it's definitely more academic than say Art, Textiles, Home Economics.
Some universities consider business and economics to be rather similar, and hence interchangable. If they are looking for a well rounded candidate, this might work against you.
Personally, I would pick Maths and Physics, because you can go into maths, physics, engineering (except for bioengineering and chemical engineering for obvious reasons), computer science, finance, data science, actuarial science, economics, and anything from the business school with these subjects. Maths is one of the most requested A Levels out there, and if you're going to do something remotely quantiative, you would be expected to have it in your choices.