As many first time buyers turn to the bank of mum and dad to top up their deposits, a new report “Parental guidance not recommended” warns Australians are being caught up in a classic “Ponzi scheme”. The report by economic consultancy LF Economics – which has previously sensationally warned of a “bloodbath” when Sydney’s property bubble bursts – estimates it will now take the average first time buyer in Sydney nine years to save a deposit, up from three years in 1975.