In October 2005, three  Citigroup analysts released a report describing the pattern of growth  in the U.S. economy. To really understand the future of the economy and  the stock market, they wrote, you first needed to recognize that there  was “no such animal as the U.S. consumer,” and that concepts such as  “average” consumer debt and “average” consumer spending were highly  misleading. 
                             In fact, they said, America was composed of two distinct groups:  the rich and the rest. And for the purposes of investment decisions, the  second group didn’t matter; tracking its spending habits or worrying  over its savings rate was a waste of time. All the action in the  American economy was at the top: the richest 1 percent of households  earned as much each year as the bottom 60 percent put together; they  possessed as much wealth as the bottom 90 percent; and with each passing  year, a greater share of the nation’s treasure was flowing through  their hands and into their pockets. It was this segment of the  population, almost exclusively, that held the key to future growth and  future returns. The analysts, Ajay Kapur, Niall Macleod, and Narendra  Singh, had coined a term for this state of affairs: plutonomy.