We need a virtual currency system.
Each account would have a maximum limit and sell by date.
Your account would self adjust to match your input, necessary outgoings, and balance.
Unused balances that reach their sell by date would dissolve as unnecessary.
Investment money would be freely available to those suitably qualified to take advantage of it, but could not be owned. However it would be limited by the number of people who wanted to invest their time and effort to the project. And the number of people who could benefit from it.
The greater your turnover between input and output the greater your personal annual limit.
There would be a minimum limit for those who for one reason or another needed support. This would increase as to need , and for any output they were able to generate.
There would be a differential between the maximum and minimum annual balances based on the total population and total product. It would have a token differential of five to one maximum.
On retirement you would retain you final annual income and balance topped up annually.
If you had had a productive life you would maintain a comfortable retirement.
Healthth care and disability support would be fully covered.
Incentive would be a more comfortable and interesting life.