You can use vesting schedules to deal with the time component. Any measure of value is going to be difficult (it is under any scheme) but risk taken is a little

You can use vesting schedules to deal with the time component. Any measure of value is going to be difficult (it is under any scheme) but risk taken is a little easier. If I look at the companies I have been involved in there are very distinct phases during growth in terms of salary, prospects and job security.