Explain why Dave describes overdrafts as a sign of "crisis living."

Overdrafts are a synonym of debt

Explanation:

When overdrafts happen, it's because you're drawing more money from your account from what you actually hold in it. Dave describes overdrafts as a sign of "crisis living" because you're spending more money than you really have. In other words, you do not have sufficient funds to complete a transaction, and this may lead to extra fees that need to be paid, having as a result an increase in your negative balance; your debt will be greater because there's not enough money for you to comply with your financial obligations.