Deflation would be the biggest problem, deflation is the depreciation of money. Another way to look at it is that if you have a surplus of something it will have less value.
I hope this helped!
Yes, because if it is not his/her self-interest they will not be able to work as hard as they can and won’t fully participate, while if they wanted to do it, they could go all out as it is something they want to achieve.
I'd say D) Sandwich Generation
I might be wrong, but wanted to give it a shot
~ Good luck!