Can one usually get to where they tell which of the 3 major career fields someone is involved in?

Law, Health Care, or Business? (are these 3 career fields the 3 major ones in all jobs and careers?) even a person working at a cash register at mcdonalds is involved in the business field as a cash register operator?)



but if you observe say 300 people from wealthier upper class neighborhoods all together..can you get to where you can pick out which ones are most likely involved in Law , Busines or Health care? why for that? and how these 3 compare at the top ? meaning people that make very good incomes and why?



please explain or add to this what you can



thanks fo ryour answers!Can one usually get to where they tell which of the 3 major career fields someone is involved in?
You can't tell what someone does by just observing them - in the right type of role they could all be earning well over $200k per annum

There are other fields that you have omitted from you list for instance charity work, the church/religion