1. A Raw Deal for Commodities, «The Economist», 15 April 1999.
2. Cfr. B.C. Clayton, Commodity Markets and the Global Economy, Cambridge UP, Cambridge 2016, pp. 40-41.
3. Cfr. R.G.D. Allen, Index Numbers in Theory and Practice, Palgrave Macmillan, London 1975, p. 202.
4. Cfr. R. Dudley Edwards, The Pursuit of Reason: The Economist, 1843-1993, Harvard Business School Press, London 1993, p. 494.
5. 160 years on. It is time to rebase our commodity-price index, «The Economist», 10 February 2005.