6. In 1989 the NBC television network in the United States announced a new way of compensating the local television stations affiliated with the network. These independently-owned stations carry NBC programs during prime-time" evening hours from 8:00 to 11:00p.m NBC earns its revenues by selling advertising time to national advertisers whose ads appear during the network's shows. The amount NBC gets for its advertising time depends on the number of viewers its programs attract. The number of viewers watching a particular station (and thus the network's programs) during prime-time depends in part on the number of people who are attracted to watch the non-network programs that the station shows before prime time. These viewers tend to stay with the channel that they started watching on a given evening. NBC's innovation was to begin paying its affiliates in part on the basis of the number of viewers that they attracted for their early-evening programming, such as local news, rather than just on the size of the audiences that watched the prime-time network programs on the station. Analyze this plan in terms of the principles developed in this chapter