Although many are PhDs, their ability varies widely. Here is my personal ranking. It is completely subjective and don’t take it seriously.

Working ability tier:

X: dissertation on theory based model with applied mathemaitics. Most MIT Phd and berkeley Phds get a degree with work like that.

S+: dissertation on theoretical econometrics and develops statistic estimators for others to use.

A: dissertation with good contributions utilizing empirical analysis, for example, aplied econometrics, applied statitics, machine learining and so on so forth.

B: dissertation with little incremental contributions utilizing empirical analysis, for example, aplied econometrics, applied statitics, machine learining and so on so forth.

C: PhDs who get a degree on management, business management, phychology, travel subjects who develop a new empirical method or a software package for others to use.

D: PhDs who get a degree on management, business management, phychology, travel subjects who did their research with empirical analysis.

E: PhDs who get a degree on environmental subjects.

Only tier S+ and X can take the name of a talent. Others literally know nothing and does not have the ability to capacitate himself any type of job that is offered.