Similar to @OneSecond I did Business Studies A Level and went on to study it at University and specialise in a sub-function.
The first year of my degree was a repeat of my A Level, just in more depth and had a bit more focus on economics actually.
I liked how broad both my A level and degree was, especially being a 16-18 year old who wasn’t sure what she wanted to do, it gave me a chance to learn a bit about all subjects. Personally, whilst economics sounds more academic, I think it can narrow you to one small aspect of studying business overall.
It’s a fascinating subject and so varied - you have Economics, Commercial Finance, Accounting, Procurement, Operations, HR, Analysis, Research and Development (NPD), Legal, Commercial, Sales, Marketing, Customers, Markets/Industries etc and studying all gives you a broad knowledge to then give options to specialise, even later in your degree.
By my final year of my degree, I elected subjects of the profession I’m in now, so specialised at that point (20 years old) and climbed a career ladder in that area. My degree continues (20 years later) to be a good basis of my knowledge.