How do interest groups help improve the principal-agent relationship between politicians and voters?

Question

Quizplus · Accepted Answer

Interest groups can serve as intermediaries between politicians and voters, as they can gather and convey information about the preferences and concerns of their members. By doing so, interest groups can improve the principal-agent relationship by reducing information asymmetry and helping to align the interests of politicians with those of their constituents. Selective incentives (D) can also help to align the interests of politicians with those of an interest group, but this may not necessarily improve the relationship between politicians and voters as a whole. Suing legislators (B) or staging Astroturf campaigns (C) may be tactics used by interest groups, but they do not inherently improve the principal-agent relationship between politicians and voters.

How Do Interest Groups Help Improve the Principal-Agent Relationship Between