The commodity price boom that emerged in 2004 has proved far more persevering than its predecessors of 1950 and 1973. Some analysts have suggested that it may represent the start of a "supercycle" caused by the voracious raw materials demand from China and other emerging economies, with prices...

In their recent article, Tilton et al. (2011, Resour. Policy, 36, 187–195) contend on the basis of conceptual and theoretical arguments that spot and futures prices for metals and other commodities should be closely correlated during periods of strong contango and much less correlated during...

In a recent article (Tilton et al., 2011), we argue that even when investor stocks are declining an increase in investor demand can cause a commodity's price to rise, a conclusion that is both contrary to conventional wisdom and counter-intuitive. In his comment on our article, Olle Östensson...

This, our second reply to Östensson, supplements our earlier more technical analysis with a simple intuitive explanation of how investor demand can be driving commodity prices higher even when investor stocks are falling.

The cumulative availability curve shows the quantities of a mineral commodity that can be recovered under current conditions from existing resources at various prices. The future availability of a mineral commodity depends on the shape of its cumulative availability curve (determined by geologic...