How does rational ignorance discourage voting?

How can a small special interest group win in a situation of majority voting when the benefits it seeks flow only to a small group?

How can pork-barrel spending occur in a situation of majority voting when it benefits only a small group?

Why do legislators vote for spending projects in districts that are not their own?

Why does a voting cycle make it impossible to decide on a majority-approved choice?

How does a government agency raise revenue differently from a private company, and how does that affect the way government decisions are made compared to business decisions?