Moving up or down in social class you may find yourself out of your element.
I grew up solidly middle class and took for granted health insurance and doctor visits whenever needed. When I got out on my own and didn't have such things I didn't know how to navigate the world. I lived for 4 years in a small town never seeing the doctor until an emergency situation forced me to go in - and then we were referred to the free medical clinic. Ha! I could have used that medical clinic for years if I had known such things existed. (Question 17 below)
Here's an interesting link (I can check off all the middle class boxes but practically none of the poverty or upper class items).
http://www.asanet.org/sites/default/files/savvy/introtosociology/Documents/Hidden%20Rules%20of%20Social%20Class.htmSurviving in Poverty
_____1. I know which churches and sections of town have the best rummage sales.
_____2. I know where the nearest food bank is and when it is open.
_____3. I know which grocery stores garbage bins can be accessed for thrown-away food.
_____4. I know how to get someone out of jail.
_____5. I know how to physically fight and can defend myself if necessary.
_____6. I know how a person can get a gun even if they have a police record.
_____7. I know how to keep my clothes from being stolen at the Laundromat.
_____8. I know what problems to look for in a used car.
_____9. I know how to live without a checking account.
_____10. I know how to get by without electricity and without a phone.
_____11. I know how to use a knife as scissors.
_____12. I can entertain a group of friends with my personality and my stories.
_____13. I know what to do when I don't have the money to pay my bills.
_____14. I know how to move my residence in less than a day.
_____15. I know how to feed 8 people for 5 days on $100.
_____16. I know how to get and use food stamps.
_____17. I know where the free medical clinics are and when they are open.
_____18. I am very good at trading and bartering.
_____19. I know how to get around without a car.
_____20. I know what day of the month welfare and social security checks arrive.