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effects and their consequences have expanded beyond the domain of public affairs to explore settings as diverse as sports, religion, and business. All of these media effects upon the public are presented in this volume, not just theoretically, but in terms of the empirical evidence on these effects worldwide.

      In contrast to the piecemeal historical evolution of our knowledge about agenda setting since the seminal 1968 Chapel Hill study, the chapters of this book strive for an orderly and systematic presentation of what we have learned over those years, an attempt to integrate the vast diversity of this evidence – diverse in its historical and geographical settings, mix of media and topics, and research methods. Presenting this integrated picture – in the words of John Pavlik, a Gray’s Anatomy of agenda-setting theory7 – is the central purpose of the book. Much of the evidence forming this picture is from an American setting because the ‘founding fathers’ of agenda setting, Donald Shaw, David Weaver,8 and myself, are American academics, and the majority of the empirical research until recently has been conducted in the United States. However, the reader will encounter considerable evidence from Western Europe, East Asia, Latin America, and the Middle East. One of the great strengths of agenda-setting theory is this geographical and cultural diversity in the evidence replicating the major aspects of this influence on society.

      The theory of agenda setting is a complex intellectual map still in the process of evolving. Although the emphasis in this book is on an empirically grounded media-centric map of what we now know about the role of the media in the formation of public opinion, there also is discussion in the later chapters of the larger context in which this media influence occurs. This agenda-setting role of the media has been a rich lode for scholars to mine for more than fifty years, and yet much of its wealth remains untapped. However, even the existing theoretical map already identifies exciting new areas to explore, and the flux in our contemporary public communication system has created a plethora of new opportunities for elaborating the map presented here.

      Even within the original domain of public opinion, there is more to consider than just the descriptions and explanations of how the media influence our views of public affairs. For journalists this phenomenon that we now talk about as the agenda-setting role of the news media is an awesome, overarching ethical question about what agenda the media are advancing. ‘What the public needs to know’ is a recurring phrase in the rhetorical repertoire of professional journalism. Does the media agenda really represent what the public needs to know?9 In a moment of doubt, the executive producer of ABC News’ Nightline once asked: ‘Who are we to think we should set an agenda for the nation? What made us any smarter than the next guy?’10 To a considerable degree, journalism is grounded in the tradition of storytelling. However, good journalism is more than just telling a good story. It is about telling stories that contain significant civic utility.11 The agenda-setting role of the media links journalism and its tradition of storytelling to the arena of public opinion, a relationship with considerable consequences for society. And the expanding media landscape and evolution of journalism and political communication presents significant questions about the formation of public opinion.

      Maxwell McCombs

      Austin, Texas, March 2020

      The American humourist Will Rogers was fond of prefacing his sardonic political observations with the comment, ‘All I know is just what I read in the newspapers.’ This comment is a succinct summary about most of the knowledge and information that each of us possesses about public affairs, because most of the issues and concerns that engage our attention are not amenable to direct personal experience. As Walter Lippmann long ago noted in Public Opinion, ‘The world that we have to deal with politically is out of reach, out of sight, out of mind.’1 In Will Rogers’ and Walter Lippmann’s day, the daily newspaper was the principal source of information about public affairs. Today we have a vastly expanded panoply of communication channels, but the central point is the same. For nearly all of the concerns on the public agenda, citizens deal with a second-hand reality, a reality that is structured by journalists’ reports about these events and situations, which in turn are amplified, transformed, and commented upon by users across digital and mobile media.

      A similar, parsimonious description of our situation vis-à-vis the news media is captured in sociologist Robert Park’s venerable phrase, the ‘signal function’ of the news.2 The daily news alerts us to the latest events and changes in the larger environment beyond our immediate experience. But the news media do considerably more than signal the existence of

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