School;
of;
Economics,;
Yunnan;
University,;
Kunming;
650091,;
China;
School;
of;
Economy;
and;
Trade,;
Yunnan;
Agricultural;
University,;
Kunming;
650201,;
China;
School;
of;
Public;
Management,;
Yunnan;
University,;
Kunming;
650091,;
China;