How do you make decisions between cofounders?
elviejo: You choose the option that gives you the biggest return on invest per time of the constraint. In this case your development time probably is the constraint.ie.
            Sales price    Raw Materials  Margin
Product A   1000 us        200 usd         800
Product B   2000 us        200 usd        1800so seems like product B is a no brainer right?But if we consider the time it takes to implement:
            Margin   Time to Develop  Margin / hrs
Product A    800         100 hrs        8 usd / hr
Product B   1800         300 hrs        6 usd / hrSo product A is in fact a better use of your time.This analysis method is called Throughput Accounting.
From a management philosophy called: Theory of Constraints