Money demand occurs because people ____ and will pay a price for it known as the interest rate. This ____ true for those who hold high sums of money in a checking and savings account. a. have insufficient income for many of their needs // is also b. have insufficient in come for many of their needs // is not c. need to have a certain amount of liquidity since non-liquid assets cannot be easily traded /is also d. need to have a certain amount of liquidity since non-liquid assets cannot be easily traded / is not