事实上，MASTER DEGREE ISN'T REQUIRED, 而不是不被承认，因为本科已经可以直接申请了，且不论是美国或中国的硕士都不是必需的。你可以上芝加哥大学的网站上PHD PROGRAM一看便知。
如UChicago Booth Business School:
Q. I already have an MBA/Master's Degree.  Will this reduce my time to the PhD Degree?
A. No. Prior coursework at the graduate level will not reduce your time to degree. There is very little overlap between MBA and PhD level coursework (even if your MBA was earned from Chicago Booth).  
见这里：http://www.chicagobooth.edu/phd/faq.aspx#Pr5
还有一个好像是哈佛还是伯克利我记不得了，直接表明是不是需要的。太晚了，下次找给你吧！

受教~~~~多谢！！

现在人人都往金融钻，也不看看自己到底是不是真正适合

不是吧。。。。

不太清楚美国的情况

what is the point of doing two masters?
wasting time, money, youth, efforts etc.

很多人并不是真的想做研究、当老师才出国。尤其经济学领域