The paragraph relates to management of spectrum of radio frequencies allocated to the mobile industry. Sentence 2 introduces the fact that spectrum management regime is moving from control and command to flexibility. Next, sentence 5 says how an ever increasing range of services has hiked the demand. Sentence 4 follows stating what restricts supply to meet the demand. Further, 3 mentions the political and market related challenges faced by spectrum managers. Lastly, 1 suggests what the spectrum managers need to do to meet these challenges.