Tiago Peixoto explains the problem:

“In my frequent conversations about open government and citizen participation, the subject of elite capture (or “how representative it is”) is almost unavoidable. Some go as far as evaluating participatory initiatives on the grounds of an ideal notion of representativeness: participants should perfectly mirror the socio-demographic traits of the larger population from which they come.

But oddly enough, the same people who raise these concerns about participatory initiatives are much less inclined to apply the same reasoning and standards to traditional politics. In other words, few take the time to consider how representative and inclusive existing electoral democracy actually is. An article by Nicholas Carnes at the New York Times about political representation in the United States puts the issue into perspective:

If millionaires were a political party, that party would make up roughly 3 percent of American families, but it would have a super-majority in the Senate, a majority in the House, a majority on the Supreme Court and a man in the White House. If working-class Americans were a political party, that party would have made up more than half the country since the start of the 20th century. But legislators from that party (those who last worked in blue-collar jobs before entering politics) would never have held more than 2 percent of the seats in Congress.

I’ve yet to see a participatory process that produces similar results. But the limits of representation do not stop there. African Americans and Latinos are still greatly under-represented in US politics. The gender issue is no different: with the House of Representatives only 17 percent women, the Inter Parliamentary Union ranks the US 82nd in female representation in politics, behind countries such as the Arab Emirates, Sudan, Mauritania and Kazakhstan.

Obviously, the US is by no means exceptional in exclusion. Those working in the field of political participation have long been aware of the excluding effect of representative systems. As put by political scientist Arend Lijphart, unequal participation remains as representative democracy’s “unresolved dilemma.” Even more unfortunately, underlines Lijphart, inequalities in representation and influence “are not randomly distributed, but systematically biased in favor of more privileged citizens (…) and against less advantaged citizens”.

And it is from this unresolved dilemma that the raison d’être of participatory innovations stems. But rather than a replacement for representative systems (as misunderstood by some), participatory innovations are complementary mechanisms to enable the participation of individuals who are systematically excluded from traditional politics, ultimately increasing the overall diversity of voices that influence government.

This observation leads to a fundamental issue when assessing citizen participation initiatives: beyond questioning demographic representativeness, one must also consider the extent to which initiatives succeed (or not) in promoting the participation of previously marginalized sectors of society (i.e. inclusiveness).”

(the article then discusses NYC participatory budgeting as case study)