 In 1981, Sherwin Rosen examined the economics of superstars to determine why "relatively small numbers of people earn enormous amounts of money and seem to dominate the fields in which they engage" Rosen argues that, in superstar markets, "small differences in talent at the top of the distribution will translate into large differences in revenue".Rosen points out that "sellers of higher talent charge only slightly higher prices than those of lower talent, but sell much larger quantities; their greater earnings come overwhelmingly from selling larger quantities than from charging higher prices".Microeconomist Alfred Marshall explains that technology has greatly extended the power and reach of the planet's most gifted performers.