Columbia Business School Research

The rate of increase of longevity has varied considerably across U.S. states since 1991. This paper examines the effect of the quality of medical care, behavioral risk factors (obesity, smoking, and AIDS incidence), and other variables (education, income, and health insurance coverage) on life expectancy and medical expenditure using longitudinal state-level data. We examine the effects of three different measures of the quality of medical care.

What are the respective roles of the public and private sectors in drug development?

We examine how consumers update their confidences in ordinal (relative) judgments while evaluating sequential product-ranking and source-accuracy data in percentage versus frequency formats. The results show that when sequential data are relatively easier to mathematically combine (e.g., percentage data), consumers revise their judgments in a way that is consistent with an averaging model but inconsistent with the normative Bayesian model.

This paper proposes an accounting for revenues as an alternative to the proposals currently begin aired by the FASB and IASB. Existing revenue recognition rules are vague, resulting in messy application, so the Boards are seeking a remedy. However, their proposals replace the traditional criteria — revenue is recognized when it is both "realized or realizable" and "earned" — with similarly vague notions that require both the identification of a "performance obligation" and the "satisfaction" of a performance obligation.

In this research we propose a web-based adaptive self-explicated approach for multi-attribute preference measurement (conjoint analysis) with a large number (ten or more) of attributes. Our approach overcomes some of the limitations of previous self-explicated approaches. We developed a computer-based self-explicated approach that breaks down the attribute importance question into a sequence of constant-sum paired comparison questions.

We propose an origination-and-contingent-distribution model of banking, in which liquidity demand by short-term investors (banks) can be met with cash reserves (inside liquidity) or sales of assets (outside liquidity) to long-term investors (hedge funds and pension funds). Outside liquidity is a more efficient source, but asymmetric information about asset quality can introduce a friction in the form of excessively early asset trading in anticipation of a liquidity shock, excessively high cash reserves, and too little origination of assets by banks.

When partially inalienable managerial entrenchment is introduced to Zwiebel's 1996 model of dynamic capital structure, anticipated debt renegotiation between a higher-type manager and the creditor reduces expected firm value. Only lower-type managers can issue debt to avoid shareholder takeover.

The Internet has increased the flexibility of retailers, allowing them to operate an online arm in addition to their physical stores. The online channel offers potential benefits in selling to customer segments that value the convenience of online shopping, but it also raises new challenges. These include the higher likelihood of costly product returns when customers' ability to "touch and feel" products is important in determining fit.

SLCapex is a stock exchange owned and operated by "residents" of the online virtual world Second Life. Despite its almost complete lack of regulation and legal protections against fraud or insider trading, issuers were able to raise approximately US$145,000 from investors, which grew to US$900,000 in market value before plummeting, resulting in overall investor returns of 271%.

We study the bidding strategies of vertically differentiated firms that bid for sponsored search advertisement positions for a keyword at a search engine. We explicitly model how consumers navigate and click on sponsored links based on their knowledge and beliefs about firm qualities. Our model yields several interesting insights; a main counterintuitive result we focus on is the "position paradox." The paradox is that a superior firm may bid lower than an inferior firm and obtain a position below it, yet it still obtains more clicks than the inferior firm.

We propose that hierarchy is such a prevalent form of social organization because it is functionally adaptive and enhances a group's chances of survival and success. We identify five ways in which hierarchy facilitates organizational success. Hierarchy (a) creates a psychologically rewarding environment; (b) motivates performance through hierarchy-related incentives; (c) capitalizes on the complementary psychological effects of having versus lacking power; (d) supports division of labor, and, as a result, coordination; and (e) reduces conflict and enhances voluntary cooperation.

Decisions, both moral and mundane, about saving individuals or resources at risk are often influenced not only by numbers saved and lost but also by proportions of groups saved and lost. Consider choosing between a program that saves 60 of 240 lives at risk and one that saves 50 of 100. The first option maximizes absolute number saved; the second, proportion saved. In two studies, we show that the influence of proportions on such decisions depends on how items at risk are mentally represented.

We address the simultaneous determination of pricing, production, and capacity investment decisions by a monopolistic firm in a multi-period setting under demand uncertainty. We analyze the optimal decision with particular emphasis on the relationship between price and capacity. We consider models that allow for either bi-directional price changes or models with markdowns only, and in the latter case we prove that capacity and price are strategic substitutes.

Standard valuation models forecast cash flows or earnings, add a growth rate, and discount the cash flows to their present value with a discount rate that typically reflects the cost of capital. But as the author argues, projecting the long-term growth rate is essentially speculative; and along with uncertainty about the growth rate, analysts generally do not have a good grasp of the discount rate either.

Accounting and valuation are so intertwined that valuation is really a matter of accounting; valuation involves accounting for value. Accordingly, a valuation is only as good as the accounting underlying it. How can one ask the question of what the price-earnings should be if the earnings are fuzzy? What is the meaning of price-to-book if book values are suspect? There is a question for both the investor and the accountant to answer: What is good accounting for valuation? Do International Financial Reporting Standards (IFRS) or U.S.

Direct advertising—sending promotional messages to individual customers—is increasingly used by marketers as a result of the recent improvements in consumer reachability. Most current methods to calculate optimal budgets for such advertising campaigns consider customers in isolation and ignore word-of-mouth communication (WOM). When the customer base forms a network (as is the case in telecom or social network databases) ignoring WOM clearly leads to suboptimal advertising budgets. This paper develops a model to help address this challenge.

This article discusses the underlying dynamics behind the present debate over net-neutrality, analyzes the pro's and con's, concludes that the debate is based on false premises, and proposes a better solution — end-user sovereignty — that is both open and only lightly regulated.

Using the employee opinion survey responses from several thousand employees working in 193 branches of a major U.S. bank, we consider whether there is a distinctive workplace component to employee attitudes despite the common set of corporate human resource management practices that cover all the branches. Several different empirical tests consistently point to the existence of a systematic branch-specific component to employee attitudes.

Research on the relationship between teachers' characteristics and teacher effectiveness has been underway for over a century, yet little progress has been made in linking teacher quality with factors observable at the time of hire. However, most research has examined a relatively small set of characteristics that are collected by school administrators in order to satisfy legal requirements and set salaries.

Engaging the public with climate change has proved difficult, in part because they see the problem as remote. New evidence suggests that direct experience of one anticipated impact — flooding — increases people's concern and willingness to save energy.

Commercial open source software (COSS) products — privately developed software based on publicly available source code — represent a rapidly growing, multi-billion-dollar market. A unique aspect of competition in the COSS market is that many open source licenses requirefirms to make certain enhancements public, creating an incentive for firms to free-ride on the contributions of others. This practice raises a number of puzzling issues. First, why should airm further develop a product if competitors can freely appropriate these contributions?

The empty creditor problem arises when a debtholder has obtained insurance against default but otherwise retains control rights in and outside bankruptcy. We analyze this problem from an ex-ante and ex-post perspective in a formal model of debt with limited commitment, by comparing contracting outcomes with and without insurance through credit default swaps (CDS).

Firms in several markets attract consumers by offering discounts in other unrelated markets. This promotion strategy, which we call "cross-market discounts," has been successfully adopted in the last few years by many grocery retailers in partnership with gasoline retailers across North America, Europe, and Australia. In this paper, we use an analytical model to investigate the major forces driving the profitability of this novel promotion strategy. We consider a generalized scenario in which purchases in a source market lead to price discounts redeemable in a target market.

The current studies investigate whether different forms of fatalistic thinking follow from the Christian and Hindu cosmologies. We found that fatalistic interpretations of one's own life events center on deity influence for Christians, especially for those high in religiosity; however, Hindu interpretations of one's own life emphasized destiny as much as deity. Also, the focus on fate over chance when explaining others' misfortunes depends on the presence of known misdeeds for Christians, but not for Hindus.

Recent frauds have questioned the efficacy of the SEC's enforcement program. We hypothesize that differences in firms' information sets about SEC enforcement and constraints facing the SEC affect firms' proclivity to adopt aggressive accounting practices. We find that firms located closer to the SEC and in areas with greater past SEC enforcement activity, both proxies for firms' information about SEC enforcement, are less likely to restate their financial statements.

Disparity between control and ownership rights gives rise to the risk of tunneling by the controlling shareholder. This disparity is prevalent in many emerging market economies and present in some developed countries. This paper studies whether and how the degree of control-ownership disparity in investors' home countries affects their portfolio choice in an emerging market. It combines two unique data sets on ownership and control in business groups, and investor-stock level foreign investment in Korea.

Social power, alcohol intoxication, and anonymity all have strong influences on human cognition and behavior. However, the social consequences of each of these conditions can be diverse, sometimes producing prosocial outcomes and other times enabling antisocial behavior. We present a general model of disinhibition to explain how these seemingly contradictory effects emerge from a single underlying mechanism: The decreased salience of competing response options prevents activation of the Behavioral Inhibition System (BIS).

Experience is a new and exciting concept marketing academia and practice. This monograph reviews the various meanings of experience as the term is used in philosophy, psychology, and in consumer behavior and marketing. I will discuss the key concepts of experience marketing such as experiential value, different types of experiences, the distinction between ordinary and extraordinary experiences and experience touchpoints.

Financial openness is often associated with higher rates of economic growth. We show that the impact of openness on factor productivity growth is more important than the effect on capital growth. This explains why the growth effects of liberalization appear to be largely permanent, not temporary. We attribute these permanent liberalization effects to the role financial openness plays in stock market and banking sector development, and to changes in the quality of institutions. We find some indirect evidence of higher investment efficiency post-liberalization.

Campbell et al. (2001) document that firms' stock returns have become more volatile in the U.S. since 1960. We hypothesize and find that deteriorating earnings quality is associated with higher idiosyncratic return volatility over 1962–2001.

While millions of products are sold on its retail platform, Amazon.com itself stocks and sells only a very small fraction of them. Most of these products are sold by third-party sellers who pay Amazon a fee for each unit sold. Empirical evidence clearly suggests that Amazon tends to sell high-demand products and leave long-tail products for independent sellers to offer.

We consider the Kiefer-Wolfowitz (KW) stochastic approximation algorithm and derive general upper bounds on its mean-squared error. The bounds are established using an elementary induction argument and phrased directly in the terms of tuning sequences of the algorithm. From this we deduce the non- necessity of one of the main assumptions imposed on the tuning sequences in the Kiefer-Wolfowitz paper and essentially all subsequent literature.

This research examines how consumers' spending on themselves versus others can be affected by temporary shifts in their states of power. Five experiments found that individuals experiencing a state of power spent more money on themselves than on others, whereas those experiencing a state of powerlessness spent more money on others than on themselves. This effect was observed using a variety of power manipulations (hierarchical roles, print advertisements, episodic recall, and mental role-playing), across spending intentions and actual dollars spent, and among college and national samples.

A major governance problem in closely-held corporations arising from the illiquidity of shares is the majority shareholders' expropriation of minority shareholders. As a solution, legal and finance research recommends that the main shareholder surrender some control to minority shareholders via ownership rights. We test this proposition on a large dataset of closely-held corporations. We find that shared-ownership firms report substantially larger return on assets (up to 14 percentage points) and lower expense-to-sales ratios.

This guest editorial of JAR considers what the "new normal" of marketing will be and suggests that it will be the digitization of everything, the need for constant change and adaptation affected by the continuous flow of knowledge. Involving consumers in co-creation will be increasingly important, while raw data for market research has increased massively and so will require the tools and people to mine it.

The past 25 years have represented two periods of extreme movements in U.S. and global house prices that appear to be much larger than can be easily explained by changes in fundamentals. These episodes spurred research on housing bubbles that focused attention on the role of outsized expectations in excessive house price appreciation. By contrast, some economists pointed to alternative explanations for excess volatility, including liquidity constraints, lending cycles, search externalities, and zoning delays.

In many service industries, companies compete with each other on the basis of the waiting time their customers experience, along with other strategic instruments such as the price they charge for their service. The objective of this paper is to conduct an empirical study of an important industry to measure to what extent waiting time performance impacts different firms' market shares and price decisions.

The current research explored whether sharing intentionality leads to implicit coordination, a situation in which isolated individuals independently adopt a similar standard of behavior. We propose that knowing that a given goal is experienced in common with other in-group members or similar others intensifies goal pursuit. Two experiments examined whether simply being aware that one's own individual goal was also being separately pursued by similar others results in more goal-congruent behavior.

Will Rogers, commenting on the Depression, famously quipped: "If stupidity got us into this mess, why can't it get us out?" Rogers's rhetorical question has an obvious answer: persistent stupidity fails to recognize prior errors and, therefore, does not correct them. For three decades, many financial economists have been arguing that there are deep flaws in the financial policies of the U.S.