Breaking the Cycle: How the News and Markets Created a Negative Feedback Loop in COVID-19
New research from CBS Professor Harry Mamaysky reveals how negativity in the news and markets can escalate a financial crisis.
New research from CBS Professor Harry Mamaysky reveals how negativity in the news and markets can escalate a financial crisis.
Adapted from “Global Value Chains in Developing Countries: A Relational Perspective from Coffee and Garments,” by Laura Boudreau of Columbia Business School, Julia Cajal Grossi of the Geneva Graduate Institute, and Rocco Macchiavello of the London School of Economics.
Adapted from “Online Advertising as Passive Search,” by Raluca M. Ursu of New York University Stern School of Business, Andrey Simonov of Columbia Business School, and Eunkyung An of New York University Stern School of Business.
This paper from Columbia Business School, “Meaning of Manual Labor Impedes Consumer Adoption of Autonomous Products,” explores marketing solutions to some consumers’ resistance towards autonomous products. The study was co-authored by Emanuel de Bellis of the University of St. Gallen, Gita Johar of Columbia Business School, and Nicola Poletti of Cada.
Co-authored by John B. Donaldson of Columbia Business School, “The Macroeconomics of Stakeholder Equilibria,” proposes a model for a purely private, mutually beneficial financial agreement between worker and firm that keeps decision-making in the hands of stockholders while improving the employment contract for employees.
At Columbia Business School, our faculty members are at the forefront of research in their respective fields, offering innovative ideas that directly impact the practice of business today. A quick glance at our publication on faculty research, CBS Insights, will give you a sense of the breadth and immediacy of the insight our professors provide.
As a student at the School, this will greatly enrich your education. In Columbia classrooms, you are at the cutting-edge of industry, studying the practices that others will later adopt and teach. As any business leader will tell you, in a competitive environment, being first puts you at a distinct advantage over your peers. Learn economic development from Ray Fisman, the Lambert Family Professor of Social Enterprise and a rising star in the field, or real estate from Chris Mayer, the Paul Milstein Professor of Real Estate, a renowned expert and frequent commentator on complex housing issues. This way, when you complete your degree, you'll be set up to succeed.
Columbia Business School in conjunction with the Office of the Dean provides its faculty, PhD students, and other research staff with resources and cutting edge tools and technology to help push the boundaries of business research.
Specifically, our goal is to seamlessly help faculty set up and execute their research programs. This includes, but is not limited to:
All these activities help to facilitate and streamline faculty research, and that of the doctoral students working with them.
A global portrait of the phase plane for a fishery model is obtained for any acceptable values of the parameters. Three different structures of the phase plane are recovered. The first predicts an eventual collapse of the fishery. The second predicts an unstable limit cycle and an eventual stability of solutions which start inside the limit cycle. The last structure predicts two possible stable equilibria, one with high catch rate, and the other with no catch. Each structure corresponds to a different domain in the parameter space.
This paper investigates the solutions to the functional equations that arise inter alia in Undiscounted Markov Renewal Programming. We show that the solution set is a connected, though possibly nonconvex set whose members are unique up to the n* constants, characterize n* and show that some of these n* degrees of freedom are locally rather than globally independent.
This paper is concerned with the properties of the value-iteration operator which arises in undiscounted Markov decision problems. We give both necessary and sufficient conditions for this operator to reduce to a contraction operator, in which case it is easy to show that the value-iteration method exhibits a uniform geometric convergence rate.
For problems involving choices over "certain x uncertain" consumption pairs, it is almost universally assumed that the decision maker's preferences can be represented by an expected TPC (two-period cardinal) utility function.
An example for undiscounted multichain Markov Renewal Programming shows that policies may exist such that the Policy Iteration Algorithm (PIA) can converge to these policies for some (but not all) choices of the additive constants in the relative values, and as a consequence that the PIA may cycle if the relative values are improperly determined.
This paper is concerned with the optimality equation for the average costs in a denumerable state semi-Markov decision model. It will be shown that under each of a number of recurrency conditions on the transition probability matrices associated with the stationary policies, the optimality equation has a bounded solution. This solution indeed yields a stationary policy which is optimal for a strong version of the average cost optimality criterion.
This paper considers non-cooperative N-person stochastic games with a countable state space and compact metric action spaces. We concentrate upon the average return per unit time criterion for which the existence of an equilibrium policy is established under a number of recurrency conditions with respect to the transition probability matrices associated with the stationary policies.
This paper considers undiscounted Markov Decision Problems. For the general multichain case, we obtain necessary and sufficient conditions which guarantee that the maximal total expected reward for a planning horizon of n epochs minus n times the long run average expected reward has a finite limit as n approaches infinity for each initial state and each final reward vector. In addition, we obtain a characterization of the chain and periodicity structure of the set of one-step and J-step maximal gain policies.
This paper provides a new approach for solving a wide class of Markov decision problems including problems in which the space is general and the system can be continuously controlled. The optimality criterion is the long-run average cost per unit time. We decompose the decision processes into a common underlying stochastic process and a sequence of interventions so that the decision processes can be embedded upon a reduced set of states.
In a preceding paper we have introduced a new approach for solving a wide class of Markov decision problems in which the state-space may be general and the system may be continuously controlled. The criterion is the average cost. This paper discusses two applications of this approach. The first application concerns a house-selling problem in which a constructor builds houses which may be sold at any stage of the construction and potential customers make offers depending on the stage of the construction.
Reprinted in Fred Lane, (ed.), <em>Current Issues in Public Administration</em> (New York: St. Martin's Press, 1978), pp. 288- 301.
Can collective bargaining and the merit system co-exist in public employment? Many writers in the field think that concepts of merit must give way to seniority in government service, as it has in the private sector. The authors believe that view is incorrect. Indeed, by pressing for equity, and an end to patronage, unions may even be contributing to the strengthening of the merit system.
The article explores the increasing popularity and importance of interest arbitration with regard to resolving collective bargaining disputes in public sector labor relations in the U.S. In avoiding or terminating strikes that threaten basic public interest, the use of arbitration may pose the only practical means of dealing with the situation. Furthermore, third-party figures brought to negotiating disputes harbors a fairness concept that is often viewed an important ingredient of labor stability.
The purpose of this paper is to study consumer information processing within the context of attitude formation and change. Examination of the cognitive rules used by consumers in manipulating information presented in a persuasive communication seems quite relevant to understanding the impact of such communications. Persuasive communications can be viewed as presenting data to the consumer, who then manipulates and combines those data in the process of forming or changing an attitude.
A distinction is drawn between the multiattribute attitude model as a measurement device and as a theory of attitude formation and change. Using an analysis of variance paradigm to investigate the underlying multiplicative and summative assumptions, Fishbein's multiattribute theory is found to demonstrate reasonably high construct validity. Individual differences in attribute combination rules are identified, and the issue of cognitive averaging vs. cognitive summation is raised.
With so many mathematically bowdlerized, and computerized, versions of the application of systems analysis abroad it is a pleasure to welcome this purely descriptive account of the application of decision system analysis (DSA) to four marketing decision systems. Professors Capon and Hulbert describe the application of DSA to pricing, forecasting, advertising, and new product development that they carried out with the cooperation of a large, multinational, British firm specialized in the marketing of processed raw materials to secondary processors.
With so many mathematically bowdlerized, and computerized, versions of the application of systems analysis abroad it is a pleasure to welcome this purely descriptive account of the application of decision system analysis (DSA) to four marketing decision systems. Professors Capon and Hulbert describe the application of DSA to pricing, forecasting, advertising, and new product development that they carried out with the cooperation of a large, multinational, British firm specialized in the marketing of processed raw materials to secondary processors.
This research paper presents an in-depth study of two systems developed by a British oligopolist's one system for sales volume forecasting, the other system for day-to-day decisions on pricing. The paper describes two decision systems employed by a firm in an industry characterized as undifferentiated oligopoly; the development of terms of trade to suit market conditions and of short-term expectations with regard to volumes.
This research paper presents an in-depth study of two systems developed by a British oligopolist's one system for sales volume forecasting, the other system for day-to-day decisions on pricing. The paper describes two decision systems employed by a firm in an industry characterized as undifferentiated oligopoly; the development of terms of trade to suit market conditions and of short-term expectations with regard to volumes.
An examination of research studies that assume the existence of the sleeper effect concept has revealed surprising results: this effect may be observed only under certain restrictive design conditions-with subsets of the population divided on the basis of personality characteristics.
An examination of research studies that assume the existence of the sleeper effect concept has revealed surprising results: this effect may be observed only under certain restrictive design conditions-with subsets of the population divided on the basis of personality characteristics.
The degeneration of orderly relationships between city governments and their employees seriously complicates the nature of government and democracy in urban America. While most cities have not yet experienced major minimal labor breakdowns, most city governments do suffer from seemingly chronic conditions, like inadequate revenues and spiraling costs, which easily can serve as catalysts for municipal labor crises. Data show that serious labor relations problems are no longer limited to a few unfortunate cities like New York, the subject of this study.
Bank balance sheet lending is commonly viewed as the predominant form of lending. We document and study two margins of adjustment that are usually absent from this view using microdata in the $10 trillion U.S. residential mortgage market. We first document the limits of the shadow bank substitution margin: shadow banks substitute for traditional “deposit-taking” banks in loans which are easily sold, but are limited from activities requiring on-balance-sheet financing.
In this paper, I estimate the magnitude of an informational friction limiting credit reallocation to firms during the 2007 to 2009 financial crisis. Because lenders rely on private information when deciding which relationship to end, borrowers looking for a new lender are adversely selected. I show how to separately identify private information from information common to all lenders but unobservable to the econometrician by using bank shocks within a discrete choice model of relationships.