A man who changes jobs frequently, moves often, and always seems happier because of such changes is likely to be high in

The person is likely high in openness. It is where an individual is open-minded in different scenarios, they tend to receive or perceive things in the most positive way possible than accepting it negatively. They are the ones who welcomes new ideas and situations. It could be seen in the scenario above as the man seems happy despite of the changes in his life in which it shows that he accepts them in a positive way.