▁The ▁R SI ▁has ▁the ▁advantage ▁over ▁the ▁P SI ▁to ▁be ▁not ▁binary ▁and ▁for ▁this ▁reason ▁it ▁can ▁better ▁indicate ▁the ▁existence ▁of ▁struct ural ▁market ▁power . ▁ ▁Notes ▁ ▁References ▁German ▁Christoph ▁Lang : ▁Mark tm acht ▁und ▁Mark tm acht mess ung ▁im ▁deutschen ▁Groß hand els markt ▁für ▁St rom , ▁Deutsch er ▁Univers itä ts ver lag / G WF ▁Fach ver lag ▁G mb h , ▁Wies b aden ▁ 2 0 0 7 ▁ ▁English ▁London ▁econom ics ▁in ▁association ▁with ▁global ▁energy ▁dec isions : ▁Str ucture ▁and ▁Performance ▁of ▁Six ▁European ▁Wh oles ale ▁Electric ity ▁Mark ets ▁in ▁ 2 0 0 3 , ▁ 2 0 0 4 ▁and ▁ 2 0 0 5 , ▁presented ▁to ▁D G ▁Comp ▁ 2 6 ▁February ▁ 2 0 0 7 ▁Indust ry ▁Con cent r ation ▁Con cent r ation ▁R ati os ▁National ▁Statistics ▁Econom ic ▁Tr ends : ▁Con cent r ation ▁R ati os ▁ 2 0 0 4 ▁ ▁See ▁also ▁ ▁Market ▁form ▁Her find ahl ▁index ▁Micro e conom ics ▁Market ▁domin ance ▁strateg ies ▁N 5 0 ▁stat istic ▁ ▁Category : Mon opol y ▁( e conom ics ) ▁Category : Im per fect ▁competition ▁Category : R ati os <0x0A> </s> ▁Mor r iss ▁is ▁a ▁surname . ▁Notable ▁people ▁with ▁the ▁surname ▁include : ▁ ▁Frank ▁Mor r iss ▁( 1 9 2 7 - 2 0 1 3 ), ▁American