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A Ca(2+)-blockable monovalent cation channel is present in the apical membrane of the ectoderm of the gastrulating chick embryo. We used the patch clamp technique to study several single-channel permeation properties of this channel. In symmetrical conditions without Ca2+, the Na+ current carried by the channel rectifies inwardly. The channel has an(More)
T he feasibility of using field experiments to optimize marketing decisions remains relatively unstudied. We investigate category pricing decisions that require estimating a large matrix of cross-product demand elas-ticities and ask the following question: How many experiments are required as the number of products in the category grows? Our main result(More)
In recent years, many firms have had greater opportunities to conduct field experiments to help improve their marketing decisions, but the practical value of using field experiments to optimize marketing decisions remains relatively unstudied. We investigate advertising and promotion decisions that require estimating a large matrix of cross-product demand(More)
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