Well when there is no money left I doubt you can save some But a good practice is always think like you have no money left even though it's not true this way you will spend less.
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There are numerous ways to save money if you spend all of it:
1: sell you unnecessary things
2: if you have nothing to sell then give them smile as it is more precious than money.
* sell stuff
* stop unnecessary spending
* walk
* look for a way to make extra cash easily, like helping your neighbor or something
* use your credit card (if any)