Of course it teaches you stuff about your spending habits and patterns. Cash withdrawals are either earmarked as you withdraw them (for example, hitting an ATM

Of course it teaches you stuff about your spending habits and patterns. Cash withdrawals are either earmarked as you withdraw them (for example, hitting an ATM up before visiting a strip club or bar), or they're withdrawn for facilitating impulsive purchases. You know the category of things they go to, because you record it when you withdraw it - you just don't know exactly what you did with it or when.