Would it be more equitable to prohibit the poor from selling their kidneys in a free market that otherwise permitted the sale of kidneys?

1. Why have voluntary methods for increasing the supply of body organs been unsuccessful?

2. Would government expenditures for kidney disease (currently covered as part of Medicare for all persons) be higher or lower under a free-market system for kidneys?

3. Would it be more equitable to prohibit the poor from selling their kidneys in a free market that otherwise permitted the sale of kidneys?