The Johnson family is very conservative financially. They have a retirement plan where John works and share a joint checking account at their bank. They keep a lot of money in their checking account to cover short-term needs and emergencies. Both of them want to step up to a higher interest rate than a checking or savings account pays, and at the same time stay with their bank. What financial principle do they need to understand better? a. The time value of money
b. Taxes affect personal finance decisions.
c. Risk and return go hand in hand.
d. All of these are important to their situation.