Keeping track of how much you've spent by having a spending record can help you spend less and be more conscious of impulse buying, which is a challenge that most people face whenever they have a lot of money in their hands that they feel is sufficient for their wants.
A spending record can help you keep in check your spending habits so that you do not try to spend more money today than you did yesterday unless it is totally unavoidable.
Indeed, overspending and understanding is sometimes the biggest problem some people face, and one effective way to tackle this particular is situation would be to keep track of your spending habit, by doing this, you’ll be able to know exactly how and where your money goes and then possibly make readjustments when/where needed.
You’re als very correct, a lot of people end up buying things they don’t even need and probably won’t even make use of, and all this is simply because they fail to keep a proper record of their spending, maybe they just budget particular amount for shopping or accessories, and due to the fact that there’s still money left in the budget, and rather than putting the money to cover another expense, you’ll see them lavishing the money on irrelevances