Hi there,

First of all thank you for providing prompt and suggested solution - this rarely happens and is best practice to get good feedback!

This sounds a lot like Q1 in any McKinsey interview. If that's the case, I would like to move your attention away from having a “structure” and towards the actual factors. The question you're really being asked is “what are the important factors and why?".

Hence, your factors need to be:

• Relevant: Seems all fine to me, nothing sticks out as irrelevant
• Concrete: This is where interviewers will expert more because a single word or term isn't concrete. For example, what is it exactly about the “available countries" that you're thinking? What's your hypothesis as to what controls “availability”? This is what interviewers will be looking for for every single item (and how the dynamics between the factors affect each other). If you just given them a word/term without explanation, it's worth nothing because it could mean anything.
• Nicely packaged: Of course everything should be neatly packaged, ideally in a MECE way. However, I'm mentioning this last because people often get so obsessed with having the right structure and don't really go into detail where it matters, which is the actual factors themselves.

Hence, I suggest you think carefully about each factor and go a little deeper. Hope this makes sense!

Best of luck!