Fortunately, in an age when data is king, there are increasing amounts of facts and figures  to illustrate the problem. A paper published earlier this year by the Massachusetts Institute of Technology's David Autor, Christina Patterson and John Van Reenen, along with David Dorn of the University of Zurich and Harvard's Lawrence F. Katz, is creating a lot of interest within anti-trust law circles. Essentially, the authors argue that the concentration ratios - a standard indication of monopoly power - have been trending upwards in all sectors of the economy, with particularly sharp increases in such sectors as retail and finance. Crucially, the research finds that this concentration results in greater growth in sales than in employment. In other words, modern superstar firms are able to increase revenues significantly without having to employ many more people.

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