Media independence is the absence of external control and influence on an institution or individual working in the media. It is a measure of its capacity to "make decisions and act according to its logic," and distinguishes independent media from state media. The concept of media independence has often been contested as a normative principle in media policy and journalism. Nick Couldry (2009) considers that digital transformations tend to compromise the press as a common good (with a blurring of the difference between journalism and advertising, for example) by the technological, political and social dynamics that it brings. For this reason, authors such as Daniel Hallin, Kelly McBride, and Tom Rosenstiel consider other norms (such as transparency and participation) to be more relevant. Karppinen and Moe state that "what we talk about when we talk about media independence, then, are the characteristics of the relations between, on the one side, specific entities ranging from media institutions, via journalistic cultures, to individual speakers, and, on the other, their social environment, including the state, political interest groups, the market or the mainstream culture." Two factors tend to influence media independence. The disruption and crisis in business models that have supported print and broadcast media for decades have left traditional media outlets more vulnerable to external influences as they seek to establish new revenue sources. In many regions, austerity measures have led to large-scale budget cuts of public service broadcasters, dislocating employees and limiting innovation in programming. An indicator of a lack of independence is the level of public trust in the credibility of journalism. According to the Edelman Trust Barometer, trust in media seems to be declining, reflecting declines of trust in government, business and NGOs. Since 2012, online media has become more and more popular, gaining trust throughout the world, but for Mindi Chahal, awareness on the risk of "fake-news", filter bubbles and algorithms have begun to change perceptions of the credibility of online information.