The 5-4-3 Sock Replacement Rule
For every 5 new socks purchased, 4 should be allocated to the washing machine, 3 should be given to the sock drawer, and 1 should be eaten as evidence.
See: Theories on Sock Eating for a deeper exploration of this practice.
Read: The Great Sock Rotation for a step-by-step guide to rotating your socks for maximum efficiency.