Columbia Business School Research

Tests for mediation and moderation are widely employed, usually in a formulaic manner. However, these tests are only a means to the goal of developing a causal understanding of a phenomenon.

This paper integrates pricing and replenishment decisions for the following prototypical two-echelon distribution system with deterministic demands. A supplier distributes a single product to multiple retailers, who in turn sell it to consumers. The retailers serve geographically dispersed, heterogeneous markets. The demand in each retail market arrives continuously at a constant rate, which is a general decreasing function of the retail price in the market. The supplier replenishes its inventory through orders (purchases, production runs) from a source with ample capacity.

The paper "Whence Reform?" by the Polish economists Marek Dabrowski, Stanislaw Gomulka, and Jacek Rostowski (DGR) is a welcome and revealing commentary on what is called the "Stiglitz Perspective." Our main response is gratitude at DGR's agreement with the main theses of "Whither Reform?" such as the critiques of voucher privatization and of the attempts to quickly install institutional reforms involving long agency chains. Our positions are not poles apart.

The author is asked to consider the following: For a meta-analysis, how should one decide if the same independent variable was used in all studies? When one is studying the effect of a drug, it is relatively easy. However, in consumer experiments, all the experimenters may state that they manipulated the same construct, but they actually manipulated the construct in two different ways, and the type of manipulation produces differences in the results.

Economists seeking explanations for the global financial crisis of 1997-99 are reaching consensus that a major factor was weak financial institutions, which resulted in part from inadequate government regulations. At the same time many developing countries are struggling with an overregulated financial system - one that stifles innovation and the flow of credit to new entrepreneurs and that can stunt the growth of well-established firms. In particular, too many countries are relying excessively on capital adequacy standards, which are inefficient and sometimes counterproductive.

We analyze a single-period, stochastic inventory model (newsboy-like model) in which a sequence of heterogeneous customers dynamically substitute among product variants within a retail assortment when inventory is depleted. The customer choice decisions are based on a natural and classical utility maximization criterion. Faced with such substitution behavior, the retailer must choose initial inventory levels for the assortment to maximize expected profits.

Most of the market microstructure literature focuses on the liquidity of individual securities, whereas much of the asset pricing literature examines the association between systematic risk and return. We document the presence of a systematic, time-varying component of liquidity. At the moment, neither the inventory nor the asymmetric information-based approach to liquidity explains the systematic, time-varying component of liquidity.

In the field of economics, perhaps the most important break with the past - one that leaves open huge areas for future work - lies in the economics of information. It is now recognized that information is imperfect, obtaining information can be costly, there are important asymmetries of information, and the extent of information asymmetries is affected by actions of firms and individuals.

In view of the distressingly low rate of success in new product introduction, it is important to identify predictive guidelines early in the new product development process so that better choices can be made and unnecessary costs avoided. In this paper, a framework for early analysis based on the success potential embodied in the product-idea itself and the circumstances of its emergence. Based on two studies reporting actual introductions, several determinants are identified that significantly distinguish successful from unsuccessful new products in the marketplace.

For almost half a century, researchers have examined consumer knowledge of prices, often with disturbing and conflicting results. Although the general findings suggest that consumer knowledge of prices is poorer than assumed in neoclassical economic theory, significant variations among results exist. The authors synthesize findings from prior studies to determine the impact of research design choices on price recall accuracy measures.

This paper considers the current thrust in marketing to create global products, brands and strategies but also to "act local" when appropriate. Deciding which elements have similar effects and which are significantly different conceptually requires meta-analysis of each of the elements. Reviews some applications of marketing meta-analysis with a focus on international research.

Returns policies are usually thought of as being a way to insure retailers against excess inventory. The work of Pellegrini (1986), Chu (1993), Lin (1993) and Padmanabhan and Png (1997) highlights the fact that there is considerably more to returns policies than just a mechanism for insurance. Our work identifies a heretofore undocumented rationale for returns policy: its role in learning the demand for a new product. The model of manufacturer?retailer interaction assumes that the demand is uncertain but correlated across time periods.

In an empirical study using five real-world creative teams from an advertising agency, participants were given a strategic brief for a new beverage product and asked to design the layout for a print ad. Think-aloud concurrent protocols obtained from each teams copywriter, art director, and the two working together were analyzed to examine the creative process and its relationship to the created advertisement. Interpretive analyses of the protocols reveal that the teams access culturally available plot patterns but in different ways.

Permission marketing requires consumers' consent before a Web site can track them with cookies, or send them marketing email, or sell their data to another company. Yet a study by Cyber Dialogue found that 69% of U.S. Internet users did not know they had given their consent to be included on email distribution lists. Here's how it's done: Using the right combination of question framing and default answer, an online organization can almost guarantee it will get the consent of nearly every visitor to its site.

Considerable research has examined how securities information, once accessed, is cognitively processed to arrive at buy, sell or hold decisions. In contrast, this paper examines whether training novice investors to simply apply the information accessing strategies used by better-performing security analysts, prior to actual cognitive processing of the information, would improve their performance. We obtain performance differences by comparing trained subjects who used the recommended strategies with untrained subjects.

Aggregate level simulation procedures have been used in many areas of marketing. In this paper we show how individual level simulations may be used support marketing theory development. More specifically, we show how a certain type of simulations that is based on complex systems studies (in this case Stochastic Cellular Automata) may be used to generalize diffusion theory one of the fundamental theories of new product marketing.

This research examines, across 2 studies, the interplay between the valence and arousal components of affective states and the affective tone of a target ad. In the first study, music was used to induce a pleasant or unpleasant mood, while controlling for arousal. Participants were subsequently exposed to an ad that either had a positive-affective tone or was ambiguous in its affective tone. As predicted, the valence of the affective state colored the evaluation of the ad in a mood-congruent direction, but this coloring effect occurred only when the ad had an ambiguous-affective tone.

The effects of justice and dispositional attribution on reactions to negative supervisory feedback were examined in two studies. Study 1 showed that criticism delivered with greater interpersonal fairness resulted in more favourable dispositional attributions about the supervisor, more acceptance of the feedback, and more favourable reactions towards the superior and the organization. The beneficial influence of just interpersonal treatment was general across various feedback contexts, although the magnitude varied.

This paper describes the relationship between land use regulation and residential construction. We characterize regulations as either adding explicit costs, uncertainty, or delays to the development process. The theoretical framework suggests that the effects on new construction vary by the type of regulation. Using quarterly data from a panel of 44 U.S. metropolitan areas between 1985 and 1996, we find that land use regulation lowers the level of the steady-state of new construction.

Current psychological theory and research affirm the positive affective and motivational consequences of having personal choice. These findings have led to the popular notion that more choice is better, that the human ability to desire and manage choice is unlimited. Findings from three studies starkly challenge the implicit assumption that having more choice is necessarily more intrinsically motivating than having fewer options.

This paper describes,analyzes and evaluates an algorithm for estimating portfolio loss probabilities using Monte Carlo simulation. Obtaining accurate estimates of such loss probabilities is essential to calculating value-at-risk,which is a quantile of the loss distribution. The method employs a quadratic ("delta-gamma") approximation to the change in portfolio value to guide the selection of effective variance reduction techniques; specifically importance sampling and stratified sampling. If the approximation is exact,then the importance sampling is shown to be asymptotically optimal.

In this paper I use a principal-agnet framework to explore the relation between the hierarchical structure of firms and the accounting information technologies available to them. My analysis is related to that in Melumad, Mookherjee, and Reichelstein [1992] and Ziv [1993]. In this paper, I take an approach that allows the principal to choose the number of layers in the firm, the number of agents in each layer, and the quantity and quality of information in the firm (subject to the available information technology).

I survey and assess the development of continuous-time methods in finance during the last 30 years. The subperiod 1969 to 1980 saw a dizzying pace of development with seminal ideas in derivatives securities pricing, term structure theory, asset pricing, and optimal consumption and portfolio choices. During the period 1981 to 1999 the theory has been extended and modified to better explain empirical regularities in various subfields of finance.

This paper describes a general approach for dynamic control of stochastic networks based on fluid model analysis, where in broad terms, the stochastic network is approximated by its fluid analog, an associated fluid control problem is solved and, finally, a scheduling rule for the original system is defined by itnerpreting the fluid control policy.

Several online firms, including Yahoo!, Amazon.com, and Movie Critic, recommend documents and products to consumers. Typically, the recommendations are based on content and/or collaborative filtering methods.