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2012 INFORMS Marketing Science Conference June 7

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4 - Understanding Customers` Substitution Patterns when Branded<br />

Items Become Unavailable<br />

Jana Diels, Humboldt-Universitaat zu Berlin,<br />

Wirtschaftswissenschaftliche Fakultaat, Spandauer Str. 1, Berlin,<br />

Germany, diels@wiwi.hu-berlin.de, Lutz Hildebrandt,<br />

Nicole Wiebach<br />

At the point-of-sale customers are often faced with unexpected situations of reduced<br />

choice sets, e.g. caused by delistings or temporary out-of-stocks. Accordingly, it is of<br />

major importance for retailers and manufacturers to gain insight into individual<br />

substitution patterns if choice sets are reduced. Previous experimental research,<br />

predominantly directed to product introduction, has revealed that changes in the set<br />

of alternatives significantly affect customers` preferences and hence, their product<br />

choice. The objective of this research is to analyze whether the unavailability of an<br />

item induces comparable systematic shifts in choice probabilities as in the product<br />

entry case. Furthermore, a theoretical framework to understand, predict and use<br />

substitution patterns is derived by using context and phantom theory. In a series of<br />

experiments, we find strong support for the existence of certain context effects when<br />

items are permanently removed or temporarily out-of-stock. Thereby, the importance<br />

of context theory as major theoretical approach to explain switching patterns for<br />

product unavailability is approved. Moreover, implications for retailers when making<br />

assortment and inventory decisions can be derived. The results of a real-life quasiexperiment<br />

further suggest that manufacturers may encounter substantially larger<br />

losses than retailers when items are delisted from the assortment. With regard to<br />

temporal unavailability, the outcome of an online experiment extends existing outof-stock<br />

research by (1) demonstrating that a negative similarity effect arises in outof-stock<br />

situations, (2) highlighting the relevance of promotion as an essential driver<br />

for out-of-stock reactions, and (3) including a so far neglected option – branch<br />

switching.<br />

■ TA11<br />

Champions Center I<br />

Direct <strong>Marketing</strong><br />

Contributed Session<br />

Chair: Eric Schwartz, The Wharton School, 3730 Walnut Street,<br />

JMHH 700, Philadelphia, PA, 19103, United States of America,<br />

ericschw@wharton.upenn.edu<br />

1 - Calibration? Definition, Motivation and Insights Learned from a Direct<br />

<strong>Marketing</strong> Setting<br />

Kristof Coussement, IESEG School of Management, 3 Rue de la<br />

Digue, Lille, 59000, France, k.coussement@ieseg.fr, Wouter Buckinx<br />

Calibration refers to the adjustment of the posterior probabilities output by a<br />

classification algorithm towards the true prior probability distribution of the target<br />

classes. This adjustment is necessary to account for the difference in prior<br />

distributions between the training set and the test set. This article proposes a new<br />

calibration method, called the probability-mapping approach. Two types of mapping<br />

are proposed: linear and non-linear probability mapping. These new calibration<br />

techniques are applied to 9 real-life direct marketing datasets. The newly-proposed<br />

techniques are compared with the original, non-calibrated posterior probabilities and<br />

the adjusted posterior probabilities obtained using the rescaling algorithm of Saerens,<br />

Latinne, & Decaestecker (2002). The results recommend that marketing researchers<br />

must calibrate the posterior probabilities obtained from the classifier. Moreover, it is<br />

shown that using a ‘simple’ rescaling algorithm is not a first and workable solution,<br />

because the results suggest applying the newly-proposed non-linear probabilitymapping<br />

approach for best calibration performance.<br />

2 - Optimizing Target Selection of Direct Mailing by Charities<br />

Remco Prins, VU University Amsterdam, FEWEB <strong>Marketing</strong> - Office<br />

2E-19, De Boelelaan 1105, Amsterdam, 1081 HV, Netherlands,<br />

rprins@feweb.vu.nl, Bas Donkers<br />

When determining the effectiveness of existing target selection procedures in direct<br />

mailing campaigns, correcting for the resulting endogenous sample composition can<br />

be a complicated procedure. In the present study, we propose a method to determine<br />

the effectiveness of target selection procedures using an additional experimental<br />

mailing to a randomly selected group of customers. Through this field experiment, we<br />

can provide clear cut directions for improving target selection rules, without the need<br />

for explicit corrections for the impact of previous target selection activities. The<br />

proposed approach also easily allows an estimation of the net effect of sending an<br />

additional mailing, after correcting for possible cannibalization effects. We apply this<br />

method to the direct mail campaigns of four large Dutch charitable organizations. The<br />

results provide directions for improvement for each of the charities, in terms of<br />

selection rules and mail frequency.<br />

3 - Test and Learn: A Reinforcement Learning Perspective<br />

Eric Schwartz, The Wharton School, 3730 Walnut Street,<br />

JMHH 700, Philadelphia, PA, 19103, United States of America,<br />

ericschw@wharton.upenn.edu<br />

Firms run experiments to test and learn about marketing actions. However, running<br />

many so-called A/B or multivariate tests can be slow and costly, and the results from<br />

one test do not give necessarily inform what the next test should be. We frame this as<br />

an optimization problem, known as the multi-armed bandit problem, involving the<br />

tradeoff between exploring uncertain actions and exploiting what has been learned so<br />

far. The problem occurs in a range of domains from personalized website design to<br />

MARKETING SCIENCE CONFERENCE – 2011 TA12<br />

7<br />

targeted direct marketing. For instance, in customer relationship management,<br />

marketers may predict future customer value, but which actions they should select<br />

for which customers and in which contexts or channels? To provide new insight on<br />

this problem, we use a model-based algorithm to determine an optimal policy of how<br />

to run a sequence of tests to learn about the effectiveness of those actions in the most<br />

cost-efficient way. To do this, we introduce the reinforcement learning framework to<br />

the marketing literature. This approach generalizes methods commonly used in<br />

marketing to solve dynamic optimization problems. Unlike prior methods, our<br />

approach accommodates a selection among many different actions. By considering<br />

the similarity of those actions, the firm may learn about the effectiveness of action<br />

without before ever testing it. As one example, we investigate firms with a customerbase<br />

engaging in activity for free with the goal of converting some of them into<br />

paying customers. Finally, we discuss the design of field experiments for<br />

implementation of the optimal sequential marketing tests.<br />

■ TA12<br />

Champions Center II<br />

Branding<br />

Contributed Session<br />

Chair: Xiaoying Zheng, PhD Student, Guanghua School of Management,<br />

Peking University, Zhong Guan Xin Yuan No.4 Building, Beijing, 100871,<br />

China, zhengxiaoyingpku@gmail.com<br />

1 - Customer Based Multidimensional Brand Equity and<br />

Asymmetric Risk<br />

Kyoung Nam Ha, Doctoral Candidate, University of Washington,<br />

24003 SE 12th Pl, Sammamish, WA, 98075, United States of America,<br />

knha@u.washington.edu, Robert Jacobson, Gary Erickson<br />

Based on market asset theory, we investigate brand asset in influencing a firm’s<br />

performance, in particular, a firm’s risk. Building on a literature in marketing that<br />

suggests several components in constituting brand value and in finance that<br />

emphasizes the role of asymmetries in the systematic risk, we assess the extent to<br />

which dimensions of brand equity (Differentiation, Relevance, Esteem, Knowledge,<br />

and Energy) influence the downside risk, upside risk, and the differential between<br />

upside and downside risk. We find that (i) Esteem has a negative effect on the risk<br />

differential, which comes from a more pronounced positive effect on downside risk,<br />

and (ii) Energy has a positive effect on the risk differential, which comes from a more<br />

pronounced positive effect on upside risk. We also find that (iii) Knowledge has a<br />

negative effect on downside risk as well as upside risk, and, thus, it does not have a<br />

statistically significant effect on the risk differential. The empirical analysis highlights<br />

the limitations of working with an aggregate measure of beta (which aggregates over<br />

both upturns and downturns) as well as an aggregate measure of brand equity<br />

(which aggregates distinct brand equity dimensions). By showing which brand<br />

characteristics indeed affect a firm’s risk beyond simply proving the theory in<br />

marketing that brand equity will have effect on a firm’s performance, this study<br />

provides managers more pragmatic information and sophisticated insights in making<br />

strategic decisions.<br />

2 - Brand Equity and Product Recalls<br />

Sheila Goins, Assistant Professor, University of Iowa, S320 Pappajohn<br />

Business Building, Iowa City, IA, 52242-0944,<br />

United States of America, sheila-goins@uiowa.edu, Qiang Fei,<br />

Lopo Rego, Cathy Cole<br />

<strong>Marketing</strong> managers and scholars have long recognized brands as fundamental<br />

market based firm assets. The marketing literature provides compelling theoretical<br />

rationale and empirical evidence linking strong brands with competitive advantages,<br />

customer commitment and decreased price sensitivity, thus contributing to firm<br />

performance. However, little is known about how customer brand perceptions<br />

influence customer response and firm performance in light of negative events such as<br />

product recalls. The literature offers competing views with both “customer brand<br />

commitment insulate the company,” and “the bigger they are, the harder they fall”<br />

arguments being offered. Using a multi-method approach and customer-based brand<br />

equity metrics, we explore how customer brand perceptions influence the firm’s<br />

product and financial market performance following a recall announcement. We<br />

empirically test the product market using experimental data, while the financial<br />

market is tested via an event study method. We also examine competitive dynamics<br />

in product recalls. Our experimental findings reveal brand quality as critical to recall<br />

effects: lower quality recalled brands exhibit smaller decreases in brand perceptions<br />

than higher quality recalled brands. We also identify asymmetric competitive<br />

dynamics: recalling a high quality brand causes positive increases in lower quality<br />

brand evaluations, while high quality brand evaluations do not change when a low<br />

quality brand is recalled. Findings from the event study confirm the relevance of<br />

customer perceptions: firms with strong brands experience less negative abnormal<br />

returns in response to brand recalls. Our findings also indicate competitive<br />

asymmetries and distinct time horizons for shareholder responses for focal and<br />

competitor firms.

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