cheap, stingy, tight, penny pincher, frugal, scrooge, thrifty
A person who is obsessive-compulsive about money may be referred to as a "money hoarder" or "money worrier."
You could call this person a "selfish immortal."
You could call them a trigger or a source of envy.
A person who answers a questionnaire is often referred to as a respondent.
A person who studies the mind is called a psychologist.
a workaholic
You call them 'The person I owe money to'
umm by phone or if the question is meant to be (waht do you call a person with a lot of money) that answer is rich
Poor
Electrician!
smart
a spendthrift
A borrower
Debtor.
spendthrift
A payee.
Cellar/seller
businessman