This paper provides an empirical reconsideration of evidence for excess co-movement of commodity prices within the framework of univariate and multivariate GARCH(1, 1) models. Alternative formulations of zero excess co-movement are provided, and corresponding score and likelihood ratio tests are developed. Monthly time series data for two sample periods, 1960-85 and 1974-92, on up to nine commodities are used. In contrast to earlier work, only weak evidence of excess co-movement is found.
