Full Idea
Mandate Representation says they are delegates who should not deviate from instructions; Trustee says they use their discretion and judgement; Descriptive says they share group characteristics.
Gist of Idea
Representative should be either obedient, or sensible, or typical
Source
Andrew Shorten (Contemporary Political Theory [2016], 04)
Book Reference
Shorten,Andrew: 'Contemporary Political Theory' [Palgrave 2016], p.76
A Reaction
[compressed] There is also being a representative because you have an audience (such as celebrity campains). The second type was famously defended by Edmund Burke. The third implies being the same colour, or gender, or religion.