“They have a stronger work ethic,” says Jean Twenge, a San Diego State University psychology professor whose book “iGen” analyzes the group. “They’re really scared that they’re not going to get the good job that everybody says they need to make it.” Just 30% of 12th-graders wanted to be self-employed in 2016, according to the Michigan survey, which has measured teen attitudes and behaviors since the mid-1970s. That is a lower rate than baby boomers, Gen X, the group born between 1965 and 1980, and most millennials when they were high-school seniors. Gen Z’s name follows Gen X and Gen Y, an early moniker for the millennial generation.