Notes

Chapter 1

1. Data from the census on April 21, 1991 relating to England alone (not including the rest of the United Kingdom) from the website www.citypopulation.de.

2. The Economist , 27 November 1993, p. 33.

3. The Economist , 17 July 1993, p. 61.

4. Stanley Milgram (1967) The small-world problem, Psychology Today , Vol. 2, pp. 6067.

5. Malcolm Gladwell (2000) The Tipping Point: How Little Things Can Make a Big Difference , Boston: Little, Brown.