Nathalia listens intently as her economics professor describes the 4 percent unemployment rate in her county. Troubled by this statistic, she later talks with her friend Gigi, who is enrolled in a different section of the same economics course. "Unemployment in our county is horrible!" laments Nathalia. "What do you mean?" replies Gigi. "The professor clearly told us that 96 percent of people in our county have a job, which sounds pretty good to me." Which barrier to reasoning rationally could be affecting Nathalia and Gigi's conclusions?