B. Different kinds of interest groups face different challenges. Change in economy from industrial economy to service economy - difficult for unions to find new members. Citizen groups - Letters sent to people on lists purchased from brokers. On the basis of some known characteristics there are chosen as good bets to respond. Direct mail returns below 1 percent - damaging financially.
Interest groups represent people in political process.
If interest group formed - must be able to find resources to pay costs. C. Different kinds of groups stress different incentives. National citizen groups purposive benefits. If business trade group wins a tax break for firms in its industry, all the firms in that industry will benefit, regardless of whether they paid dues to that group. Convention - good place to drum up new business or learn new manufacturing processes.