An economic incentive is best described as something that

Economic incentive is best described as something that motivates producers or consumers to take action
For example, Andy's main purpose of running his business to get as money as possible. Therefore , money is considered as his economic incentive

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An economic incentive is something what motivated people to behave in certain way. Economic incentive give you the motivation to pursue your preferences (needs, wants and desires). 

Kitayama and Markus would label Joe as displaying a(n) interdependent self.

Explanation:

Self-construal refers to the way we see ourselves in the most fundamental level - if we see ourselves as connected to or separate from others. Notice how Joe's description of himself is highly connected to other people. He is the son of someone. He is somebody's boyfriend. This shows Joe's self-construal focuses on his relationships with others. Joe is displaying an interdependent self. His focus is on how he can benefit from his social connections.