am not sure how to answer this question that's y am posting this question here.

what variables would you used for identiify ing market segment??

is it about behavioural, demographic, geographic!!??

I should think it'd be all three.

City people buy differently than suburban people do. City and suburban people buy differently than people who live in rural areas do. Etc.

Teenagers buy differently than young parents do. Older people buy differently than young marrieds do. Etc.

And so on ...