Final answer:
Jack's work hours have increased due to a promotion, which relates to the field of Business and can affect various aspects such as salary, work-life balance, and job satisfaction.
Step-by-step explanation:
The scenario you've given talks about Jack's work hours changing due to a promotion. This can be related to the field of Business, specifically within areas like human resources management, labor economics, or organizational behavior. These changes in work hours can affect several aspects of the job, including compensation, work-life balance, and productivity.
For example, Jack may see an increase in his salary due to the increased amount of time he is putting into his work. However, working 50 hours a week could also have an impact on his work-life balance, potentially leading to increased stress or less time for personal activities. In a labor economics context, this increase in hours could be discussed in terms of overtime policies and how they vary by country or industry. From an organizational behavior perspective, the change in work hours might impact Jack's motivation and satisfaction with his job, which could in turn affect his performance.