Depends on where you live and what the law says. I believe some Americans would answer 'yes' to all of those. A transaction between private individuals (or non-

Depends on where you live and what the law says. I believe some Americans would answer 'yes' to all of those. A transaction between private individuals (or non-governmental organisations) is a privilege, not a right. In other parts of the world there would be limits and requirements set by the parties elected by the people, i.e. rules on what things you can and can't discriminate on (like ability to pay you can measure, but skin color is not allowed to be a factor for selling electricity). Generally there is a list of factors that you cannot use to allow/deny sale.