A bias in the interest group system that favors the wealthy is a criticism of theory of government Pluralism(1).
Some interest groups' power is disproportionate to their size in some cases. Many organizations don't represent the opinions of the individuals who claim to do so.
The features of interest group members in the United States tend to give rise to a strong upper-class tilt in interest group politics.
Do interest groups have biases? There may be a little upperclass bias in integer groups. Rich people are more likely than poor people to join and participate in interest groups, and corporate and professional interest groups are much more prevalent and well-funded than those representing minorities.
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