Tanaka has missed several important calls re- cently, because her line was busy. Her two teen- age children surf the Internet for several hours almost every day. She phones the telephone com- pany to determine possible solutions to this prob lem. Tanaka's telephone bill is at the median level for a household subscriber Most of the calls from her house are local, but there are occasional in- ternational calls to Japan and the Philippines. She does not subscribe to any value-added services.