3-6-3 Rule Definition
What Is the 3-6-3 Rule? The 3-6-3 rule is a slang term that refers to an unofficial practice in the banking industry in the 1950s, 1960s, and 1970s that was the result of non-competitive and simplistic conditions in the industry. The 3-6-3 rule describes how bankers would supposedly give 3% interest on their depositors’ accounts