Efficiencyv. collusion: Evidence cast in cement

Through the 1970s and 1980s, the U.S. portland cement industry experienced a significant increase in average plant size and market concentration. A simultaneous equation model is developed to examine the effects of plant size and concentration on costs, prices and margins in that industry. The results indicate the presence of significant scale economies, but also show that prices and margins are increasing in concentration. Further analysis shows that almost one third of the cost savings associated with larger plants are passed on to producers through higher margins resulting from concomitant increases in concentration, rather than to consumers as lower prices.     

VOLATILITY AND COVARIATION ESTIMATION WHEN MICROSTRUCTURE NOISE AND TRADING TIMES ARE ENDOGENOUS

This paper considers practically appealing procedures for estimating intraday volatility measures of financial assets. The underlying microstructure model accommodates the inherent properties of ultra high‐frequency data with the assumption of continuous efficient price processes. In this model, microstructure noise and trading times are endogenous but do not only depend on the prices. Using the (observed) last traded prices of the assets, we develop a new approach that enables to approximate the values of the efficient prices at some random times. Based on these approximated values, we build an estimator of the integrated volatility and give its asymptotic theory. We also give a consistent estimator of the integrated covariation when two assets (asynchronous by construction of the model) are observed.     

Moral Dilemmas and Factual Claims: Some Comments on Paul Krugman's Defense of Cheap Labor

In 1998, Paul Krugman published a collection of short polemical essays on economic themes under the title The Accidental Theorist And Other Dispatches from the Dismal Science . Among those essays was one entitled "In Praise of Cheap Labor: Bad Jobs at Bad Wages Are Better than No Jobs at All". This brief article is an extended comment on that piece, which happened to contain factual claims central to the empirical research program of one of us, and ethical and political issues of concern to us both. Our view is that in his essay on cheap labor, (as indeed in many of the others in the collection), Krugman makes some pungent and telling criticisms of other writers on economic matters and—in this particular case—of some analytically weak and ethically dubious claims which are frequently espoused by contemporary anti-capitalist and anti-globalization radicals conventionally regarded as being on the political left. But at the same time—or so we shall argue—his own polemic is, in important ways, undermined by the narrowness of the theoretical framework within which it is constructed, and most especially, by Krugman's almost total lack of an historical perspective in which to see either contemporary debates over global capitalism or the ethical issues at their heart.     

Redesigning Product Lines with Conjoint Analysis: How Sunbeam Does It

Sunbeam Appliance Company, faced with the task of redesigning its lines of small appliances, developed a procedure that couples consumers' evaluations of possible new designs with a marketing research technique—conjoint analysis. In this article, Albert Page and Harold Rosenbaum describe Sunbeam's redesign of its food processor product line. They report detailed information, including key design attributes, alternative product designs, market segments, and competitive positions, and describe the use of a simulation model that predicts the market share of alternative product line configurations before they are even developed or introduced into the market. The procedure provides product line managers with a powerful tool to assist them in redesigning their lines.