I had to get the Ph.D. degree (we call it here in Brazil "doutorado", or in English "doctorate degree). Because in Physics you can't get a good position without the doctorate degree here in Brazil. Also, when you get the doctorate degree, you are beginning your career of researcher. For instance, I have to publish annually a minimum number of papers in journals of certain reputation (of a minimum impact factor) so as to maintain my status. Otherwise I would not get financial support for my projects in the university, and the respective economical bonus. Therefore, my doctorate degree was my first step to be someone in the competitive world of the brazilian physicists. Of course, I know that in US and UK the competition is considerably harder, as in Germany. I had a postdoctoral position with two german physicists with a good number of papers published in Physical Review Letters (which is one of the best journals in Physics). However, they could not get a permanent position in their own country due to the hard competition.