How your brain mismanages money. Mental accounting is the cognitive error where we treat money differently based on arbitrary categories. A dollar is a dollar, but our brains do not see it that way.This book exposes the mental accounting traps. We spend tax refunds frivolously because it feels like "free money," even though it is our own money. We refuse to sell losing stocks because realizing the loss feels worse than holding it. We splurge with credit cards but hoard cash.We analyze the psychology behind these errors. Money is fungible, but emotions are not. We create mental...