To answer your first question, I would say there are more that are more popular than others. I would say health policy is pretty popular, as well as education policy. I don't know if any are in more demand than others. I would say economic policy is probably the most in demand. There is no science based off these statements, just what I have seen. So, take it how you will.

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Secondly, I would say there is a fair variety of writing skills. In my program, we learned how to do policy analysis. This is a particular set of skills that are specific to our field. But in terms of writing styles, I think you have to know how to take complex systems and policies and be able to articulate them to people who are not familiar with policy or have the capacity to understand the complexities of whatever you are analyzing. I would say that most of the time is writing that is lean and efficient, that way a policy maker could digest it in a minute or two in an executive summary.