Question: In investing, value premium refers to the greater risk-adjusted return of value stocks over growth stocks, other experts, such as John Clifton "Jack" Bogle, have argued that no value premium exists, claiming that Fama and French's research is period dependent, Bogle is an investor, business magnate, and philanthropist, of which nationality?
Sentence (from "John C. Bogle"): John Clifton "Jack" Bogle (born May 8, 1929) is an American investor, business magnate, and philanthropist.
Relevant evidence: Yes