3-6-3 RULE

Slang term for an unofficial rule describing the method of bankers on offering a specific interest rate to depositors. The bankers would place 3% on the depositors’ accounts, lend their money at 6% interest, and go out and play golf at 3:00 p.m. The rule implies the bank’s only type of business is lending out money at a higher rate than it has paid to depositors.