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“Everybody wants more radio,” conference organizer Pierre de Vries told participants by way of introduction to the Risk Assessment in Spectrum Policy conference hosted by the Silicon Flatirons Center on October 23, 2015 at the University of Colorado Law School. Spectrum access is hotly contested, De Vries explained, since there are practical limits on the number of radio devices that can operate concurrently in close proximity in time, place and frequency. The main question confronting a spectrum regulator, therefore, is whether to allow new wireless entrants to operate in frequency bands with incumbents. To answer that question the regulator must balance the potential gains to be realized from new services against possible harm that those services would cause to incumbents.