What are the most marketable Phd research areas in Business and management in North America

What are the most marketable Phd research areas in Business and management in North America?
Hi guys I hope you are all doing well. I recently finished my MBA and now I want to do my Phd. I am thinking about combining my business and management knowledge with other areas such as; information systems, technology, innovation etc.). To be honest I do not want to teach after Phd and I really want to go back to industry.
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An MBA should be all you need, but a PhD in Information Systems would be very marketable. Yahoo Answers has several hundred categories. You posted in Yahoo Products -> Yahoo Answers. The category is for questions about Yahoo answers - "How do I post a question?" "How do I pick best answer?" "Why do they asterisk out some words?" While you might get an answer to your question here, you'd probably get a much better answer, more quickly, if you posted your question again in a different category. Best wishes!