An interest rate stands for the price of time, the way a debt or a gain grows the longer it lasts. Dream books read a rising rate as pressure building on something left unpaid.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.