Two individuals engage in the same two productive activities. In which of the following circumstances would neither individual have a comparative advantage in either activity?
1) One individual's production possibilities frontier is steeper than the other individual's frontier.
2) One individual is faster at both activities than the other individual.
3) One individual's opportunity costs are the same as the other individual's opportunity costs.
4) None of the above is correct, one of the two individuals always will have a comparative advantage in one of the two activities.