• The 3-6-3 rule is a slang term for an informal practice in banking, especially in the 1950s, 1960s and 1970s, that was the result of the industry’s uncompetitive and simplistic conditions.

  • The 3-6-3 rule describes how bankers allegedly pay 3% per annum on their depositors’ accounts, lend money to depositors at 6% per annum, and then play golf by 3:00 pm.
  • After the Great Depression, the government introduced tighter banking regulations, which made it harder for banks to compete with each other and limited the services they could provide to customers; in general, the banking industry has become stagnant.