Always put money aside out of your paycheck away in a separate account to save for rainy days. Even the poorest of people can afford 5% especially if they do that from their first paycheck. I recommend 10%, but for someone making $200 a week, $20 is a lot of money. $10 is more doable in those situations.
I disagree that even the poorest people can afford 5%. Some people really can't even afford that. Unless you are one of those "poorest people" I wouldn't say that.