Realized cap reduces the impact of lost and long dormant coins, and weights coins according to their actual presence in the economy of a given chain. When a coin that was last moved at significantly cheaper prices is spent, it will re-value the coins to the current price, and thus increase realized cap by a corresponding amount. Similarly, if a coin is spent at a price lower than when it was last moved, it will re-value to a cheaper price and have a corresponding decrease on realized cap.