Economics Personal Statement

How much work experience/supercurriculars will I need to mention in my personal statement? I’m in Y12 and struggling to find opportunities that aren’t for people from low income backgrounds or are just for economics and finance in general. I worry I won’t have enough to write on my personal statement and I’m aiming for top unis such as oxbridge. Can you recommend any supercurriculars ? And how many should I aim for? Are they that important in the application process

I've submitted my application and I've not mentioned any work experience in my personal statement. I talked about things like essay competitions and my EPQ (which was related to economics). I don't think uni's are too bothered about work experience since it's always really expensive or for undergrads anyway.
I'd recommend entering a few essay competitions and reading economics books. Try not to read the most obvious ones because you want your application to stand out.

Thank you!! Do you have any interesting book recommendations? Also would you advise avoiding the ones recommended on university websites because everyone is reading them? And also, where do I find essay competitions ?