The McKinsey Quarterly: Strategy in an era of global giants:
The evolution of the mega-institution:
"The development of today's largest corporations can be traced to a remarkable shift in the mix of the top 150 companies and in the nature of the workforce they employ. Consider a striking fact: financial-services and health care companies represented just 12 percent of the top 150 in 1984 but now make up 39 percent of that elite group. These two sectors employ relatively large numbers of professionals and managers, who create value primarily by generating and using knowledge through interactions with others rather than their own individual labor."