Surveys on millennials and spending, using cash versus card, data etc.

Looking for surveys on a broad topic, but generally I want data that pertains to millennials, overspending, and how beneficial it might be if we used cash to help us stick to a budget versus a card. Please send all relevant data and I will sort through it as there’s a story I’d like to do surrounding this. Need data that is new, forthcoming, or relatively new (last few weeks). Thanks. Requirements: Please send the data, if it’s under embargo or not, how old it is, and if other people have covered it. Also – do you have relevant experts who can speak on this and provide tips on why using cash might be better than card? etc.