News sources can also provide definitions of issues, thus determining the terms of future discussion and framing problems in particular ways. As McCombs and Valenzuela stated; "We don't need the media to alert us about inflation as routine purchases reveal its presence. But to learn about abstract economic topics such as budget deficits, our main- if not only- source is the news media." What interpretation of "reality" will dominate public discourse has implications for the future of the social problem, for the interest groups and policymakers involved, and for the policy itself. For example, Gusfield argues that the highway deaths associated with alcohol consumption can be interpreted as a problem of irresponsible drunken drivers, insufficient automobile crashworthiness, a transportation system overly dependent on cars, poor highway design, excessive emphasis on drinking in adult social life. Different ways of framing the situation may compete to be accepted as an authoritative version of reality, consequently spurring competition between sources of information for definition of an issue. Very powerful resources of information can even influence whether an issue receives media attention at all.