The Mathematics of Resource Return Rate (RRR)

Resource Return Rate (RRR) measures the percentage of raw materials refunded to your inventory after refining. Effective material yield is calculated using geometric series:

Effective Multiplier = 1 / (1 - RRR)

At 53.9% RRR (Bonus City + Focus), 1,000 raw resources produce 2,169 refined resources through recursive refunds!

Multi-tier refining compounds this bonus when raw resources are processed sequentially from T4 to T8.