Nonlinear Aspects of Goods-Market Arbitrage and Adjustment: Heckscher's Commodity Points Revisited

Maurice Obstfeld and Alan M. Taylor.
Authors registered in the RePEc Author Service: Alan M. Taylor and Maurice Obstfeld

No C97-088, Center for International and Development Economics Research (CIDER) Working Papers from University of California at Berkeley

Abstract: We propose that analysis of purchasing power parity (PPP) and the law of one price (LOOP) should explicitly take into account the possibility of "commodity points" -- thresholds delineating a region of no central tendency among relative prices, possib ly due to lack of perfect arbitrage in the presence of transaction costs and uncertainty. More than eighty years ago, Heckscher stressed the importance of such incomplete arbitrage in the empirical application of PPP. We devise an econometric method to identify commodity points. Price adjustment is treated as a nonlinear process, and a threshold autoregression (TAR) offers a parsimonious specification within which both thresholds and adjustment speeds are estimated by maximum likelihood methods. Our m odel performs well using post-1980 data, and yields parameter estimates that appear quite reasonable: adjustment outside the thresholds might imply half-lives of price deviations measured in months rather than years, and the thresholds correspond to popu lar rough estimates as to the order of magnitude of actual transport costs. The estimated commodity points appear to be positively related to objective measures of market segmentation, notably nominal exchange rate volatility.

Date: 1997-05-01
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Related works:
Journal Article: Nonlinear Aspects of Goods-Market Arbitrage and Adjustment: Heckscher's Commodity Points Revisited (1997)
Working Paper: Nonlinear Aspects of Goods-Market Arbitrage and Adjustment: Heckscher's Commodity Points Revisited (1997)
Working Paper: Nonlinear Aspects of Goods-Market Arbitrage and Adjustment: Heckscher's Commodity Points Revisited (1997)
Working Paper: Nonlinear Aspects of Goods-Market Arbitrage and Adjustment: Heckscher's Commodity Points Revisited (1997)
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