Full Idea
The general theory of 'mirror representation' says that a representative body or institution should be a statistically accurate sample of the wider society it represents.
Gist of Idea
There is 'mirror representation' when the institution statistically reflects the population
Source
Andrew Shorten (Contemporary Political Theory [2016], 04)
Book Reference
Shorten,Andrew: 'Contemporary Political Theory' [Palgrave 2016], p.84
A Reaction
How fine-grained should this be in accuracy. Should every small minority have at least one rep? Can't reps be trusted to speak for people a bit different from themselves? Maybe not! He quotes Mirabeau in support of this idea.