According to my research on studies conducted by various psychologists, I can say that based on the information provided within the question Dre's beliefs are an illustration of a self-serving bias. This is people's tendency to attribute positive events to their own character but attribute negative events to external factors. Which is what Dre is exhibiting by attributing positive traits such as ethicality and competence to himself.
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Ivan's marginal benefit if he decides to stay open for six hours instead of five hours is $20. The marginal benefit can be solved by subtracting the total revenue of the equivalent hours.
Hachiro still needs to work on his accountability to be able to put into consideration the effect of the activities of his company on the society. Accountability involves being able to take record of one's action and also being to take responsibility for actions.
