We use the recent introduction of biofuels to study the effect of industry factors on the relation-ships between wholesale commodity prices. Correlations between agricultural products and oil are strongest in the 2005-09 period, coinciding with the boom of biofuels, and remain substantial until...

We present a sequence of simulations to analyse the collusive effects of transparency and different degrees of producer crossholding in energy markets. The results suggest that (a) the functional form of the crossholdings/market prices relationship is not linear and better defined by threshold...