linguistic:paraphrasing, structural:scholar_edition
Avex group

Ayumi Hamasaki won Grand Prix awards for three consecutive years—the first time in Japan Record Award history—between 2001 and 2003. Although Hamasaki became very famous, Tom Yoda, then-chairman of her record company Avex Group, argued that her tactics were risky, because Avex disregarded the modern portfolio theory. This concern disappeared when the company's other singers (such as Ai Otsuka, Kumi Koda, and Exile) also reached a certain level of popularity in the mid-2000s under Yoda's management policy. BoA, a Korean singer also a part of Avex group, also achieved high levels of success although being Korean in Japan. She opened the Hallyu door to other Korean artists so that they may achieve varying levels of success in Japan as well.