Keeping a record of your expenses doesn't double your money, but it helps you monitor your spending habits. If you notice a bit of excess, you tend to curb it. I check my spending every month, and banks keep records, so you can casually review them.

It helps you know what you're spending on, whether it's unnecessary, or if it's worth it. If you see you're spending more on material things, you can prioritize making investments or allocating a certain amount for specific purposes to balance it or take out the material spending.