A PhD is just the start of your career. To best bridge

the gaps between your background and entrepreneurship spirits would still be how to satisfy human greedy, although Economy major looks very low in value now and few people look forward to going out for ROI other than re-conditioning their bad behavior.

In this regard, you better have your life expectations in perspective incorporating your goal, advantages you can take, constraints your activities are limited to, where you customers and competitions are, and the size and publicities you are tying to achieve.

Putting this theory and model to work, just look at the sample you put up for evaluation. Are you willing to compete the girl next booth only with a high school diploma if you just commissioned to sell the weight-control product. Are you willing to deliver seminars once every week travelling from coast to coast? How long would it take for you to establish you royal costomer base to support your business? How would you mitigate the risks when you don't have positive cashflow? What is the success definition and criteria?

If you've answered all these questions for yourself, then you probably put up your money and time where you mind is.