Jetstar is now allowing people to pay for international flights with Afterpay, but a financial expert says the practice is a nosedive to financial woes.

“I’m really worried, and I’ll tell you why I’m really worried about this, is because  8 out of 10 people in Australia have no idea how much they spend each day, week, month or year.” Rachel Smith, money saving expert, told 6PR Breakfast.

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