Browsing by Subject "Demand"

Now showing 1 - 4 of 4
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    Essays on Competition in Health Insurance
    (2021-06) Ryan, Conor
    This dissertation consists of three chapters. In the first chapter, with coauthors Roger Feldman and Stephen Parente, I use a novel data set from a private online marketplace to estimate the demand for individual health insurance among a set comprising many high-income consumers across 18 states. We find that consumers earning more than 4 times the federal poverty level are willing to pay $30 to $135 per month to increase the actuarial value of their insurance by 10 percentage points, much less than low-income consumers. In the second chapter, I show that regulations to address adverse selection and competition policy should be considered complements. To see the relationship, consider the incentive for a firm to offer a product that appeals to low-risk consumers and leads high-risk consumers to purchase insurance elsewhere. This incentive problem, which leads to inefficient consumer sorting, is worst in highly competitive markets and absent in a monopoly. I estimate a model of the individual insurance market by combining the data from chapter one with a risk prediction model to relate preferences to marginal cost. I find that the largest welfare cost in the non-group market comes from high markups. Distortions coming from extensive margin selection and inefficient sorting are significantly addressed by current policies targeting adverse selection which are successful in improving total welfare. However, in the most concentrated markets, insurance firms recapture most of the added surplus through higher markups. In the final chapter, I study the effect of competition on medical consumption through the cost-sharing terms---e.g. copays and coinsurance rates--- of the insurance products. These terms determine the out-of-pocket price of medical care, which affect a patient's medical decisions and thus the patient's health outcomes. Using medical claims data linked to insurance products, I estimate a model of imperfect competition that incorporates adverse selection, moral hazard, and selection on moral hazard. First, I show that, on average, less competition leads to higher levels of cost-sharing but multi-product firms respond by increasing the cost-sharing levels of some products and decreasing others. Second, I find that medical consumption and health respond to cost-sharing terms. A $10 increase in the primary care copay leads to a 5.4% decrease in medical consumption and a 0.1 percentage point increase in inpatient mortality. Putting these results together, I find that a reduction in competition via a merger leads to up to a 4% increase in the primary care copay, an average reduction in medical spending of $17 per person, and an additional six inpatient deaths per year. At estimates of the statistical value of a life, the reduction in spending is more than outweighed by the cost of additional deaths.
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    Essays on the economics of food production and consumption in Vietnam.
    (2008-12) Vu, Linh Hoang
    This study aims to provide an in-depth understanding of the economics of food production and consumption in Vietnam. Specifically, the study is comprised of five essays, covering several aspects of agriculture and food consumption in Vietnam. The first essay studies agricultural productivity growth in Vietnam, using province-level data. It concludes that total factor productivity (TFP) growth in agriculture contributed greatly to Vietnam's agricultural success after it adopted reform policies. However, TFP growth has slowed in recent years, despite significant output growth. The second essay examines the productive efficiency of rice farming households in Vietnam, using two methods, Data Envelopment Analysis (DEA) with bootstrap and Stochastic Frontier Analysis (SFA). It points out that there is variation in efficiency estimates across regions in Vietnam. Moreover, technical efficiency is significantly influenced by primary education and regional factors. The third essay estimates household food demand parameters in Vietnam, based on a recent household survey conducted in 2006. The results indicate that that food consumption patterns in urban and rural areas, and across regions and income groups, are quite different. This implies that targeted food policies should be formulated based on the specific food demand patterns of those groups. Socio-economic factors such as household size and composition, as well as the age of the household's head and education, have sizeable and statistically significant effects on food consumption. The fourth essay focuses undernutrition and food security in Vietnam. The income elasticity of calorie consumption is estimated using both parametric and non-parametric regressions. The finding of positive and significant calorie-expenditure elasticity implies that income growth can alleviate undernutrition Finally, the fifth essay examines the impacts of rising food prices on poverty and welfare in Vietnam. Increases in food prices raise the real incomes of those selling food, but make net food purchasers worse off. Overall, the net impacts on an average Vietnamese household's welfare are positive. However, the benefits and costs are not evenly spread across the population, so some households are made better off while the others are worse off.
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    International mobility of undergraduate and Graduate Students in Science, Technology, Engineering, and Mathematics: push and pull factors
    (2013-12) Chien, Chiao-Ling
    This study examines factors that contribute to the cross-border movement of international students in science, technology, engineering, and mathematics (STEM) fields. It analyzes characteristics of host countries (pull factors) associated with international students' arrival for education in STEM fields, as well as characteristics of home countries (push factors) related to STEM student's departure for study abroad.The study applies trend analyses and random- and fixed-effects estimations to data from multiple national and international sources. The findings show that a) international STEM students are increasingly concentrated in countries where English is used for instruction and in countries with advanced technological capabilities; b) industrialized countries that have lower enrollments of their own students in STEM programs or aging populations tend to enroll more international STEM students; c) countries that are neither advanced nor substantially lagging in technological capability send more students abroad to pursue STEM education; and d) STEM students migrate more from countries that already have high emigration rates of highly educated citizens.The findings have implications for higher education policies and practices. Key issues include the following: technologically marginalized countries' low STEM enrollment, which may contribute to a widening disparity in technological capability between countries; the migration of STEM students, which suggests that countries should address possible negative effects of the loss of highly skilled citizens; and the increasing use of English as the language of science, which suggests a tendency toward more English-based instruction in non-English speaking countries.
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    Value Creation and Competition in the Grocery Delivery Market
    (2021-05) Rabello de Castro, Vitoria
    This dissertation contains three chapters, each of which is pertinent to the topic of how value is created to consumers and platform competition in the same-day grocery delivery market. All chapters make use of tools from empirical Industrial Organization. All data describing choices made by consumers used for both empirical evidence and demand estimation presented in chapters 1 and 2, respectively, pertain to the Nielsen Company (US), LLC and marketing databases provided by the Kilts Center for Marketing Data Center at The University of Chicago Booth School of Business. In the first chapter, I use the roll-out of two major same-day delivery services in several metro areas in the United Stated to study the impact of these new alternatives on consumers' retailer choice. To do so, I construct a new dataset with the timing of entry decisions of two grocery delivery platforms combine this geographic entry information with scanner data on consumer purchases to evaluate how store choices change once these new services are introduced. To measure the importance of user switching costs, in the second chapter, I estimate a demand model where consumersincur costs to update their delivery platforms choices over time. I extend Katz (2007)'s store choice model to a dynamic setting where, in addition to choosing bundles of products and retailers, consumers also pay a sunk cost to subscribe to memberships that augment their choice set of online retail alternatives. In addition to the revealed preference relations used in Katz (2007) which identify utility parameters, I estimate costs associated with subscriptions (fees and switching costs) using a second set of moments. I construct these moments using revealed preference conditions which compare the utility of maintaining the consumer's subscription choice to the utility of switching. To estimate switching costs, I use constraints that impose rational switching behavior identifying bounds on differential continuation values between subscriptions. I present evidence that switching costs are substantial: fewer than 50% of customers switch to a competitor in the face of savings of up to $40 per purchase. Using the model, I find that switching costs significantly affect consumer platform use. In the absence of switching costs, consumers would alternate between platforms from one purchase to the next ten times more often. By itself, this suggests a potential harm from the major firm's acquisition as lock-in would allow the combined firm to exercise market power in the future. In the third chapter, I model firm decisions as a dynamic entry game in which consumers' transition across platforms, predicted by the estimated demand model, governs the law of motion of firm revenues. Firms then compete in continuous time across independent markets in a similar fashion to Arcidiacono et al. (2016). I use this empirical framework to conduct a retrospective analysis of this recent acquisition. I show that an important aspect of the welfare impact of Big Tech's acquisition of the national grocery chain was Grocer Partner's strategic entry response. Big Tech's main rival could have responded to the merger by either conceding or entering markets more rapidly. When met with the competitive threat presented by the merger, Grocer Partner's own intent to build a loyal customer base increases this firm's incentive to chase a first mover advantage by entering new geographical markets earlier. Moreover, because Grocer Partner's entry costs are low, this firm is able to pursue this accelerated entry strategy giving rise to fierce competition for new markets. I find that the acquisition significantly increased both firms' speed of entry cross new markets, giving consumers earlier access to the services and generating important welfare gains in the short run. Specifically, had the acquisition not happened, both firms would have entered new markets over two years later, on average. The combined costs associated with the two firms' earlier entry due to the acquisition amount to a loss of $624 M in producer surplus. However, consumer benefits across markets that were served earlier due to this merger are larger, representing a total welfare gain of $846 M. Additionally, the fact that this merger allowed the large online retailer to enter multiple markets earlier provides an explanation for the premium paid for the acquisition. Moreover, until this merger occurred, this retail chain was Grocer Partner's largest affiliated retailer, giving it access to approximately 23 million consumers. This supports the fact that Grocer Partner anticipated how the acquisition would affect its ability to serve certain markets and reacted through earlier entry. I perform a second counterfactual that simulates a potential horizontal merger between Big Tech and Grocer Partner resulting in a monopoly. I find that, due to the lack of significant competitive threat, the monopolist would not have an incentive to serve markets early. This shows the role of competition in the timing of entry of these services. I also show that consumer losses due to delayed entry by the monopolist are larger than cost savings from this merger. In both analysis, the focus is on entry timing and firms do not choose prices in the model. For this reason, this paper is limited in its ability to capture possible future harm to consumers through prices. However, I use the demand model to show how consumers' substitution patterns as response to price changes under switching costs shed light onto issue. I find evidence that competition is important to keep prices low, especially if the firm' business model relies on economies of scale. This paper contributes to the literature on the role of consumer inertia in competition by measuring the importance of switching costs for entry strategies in a nascent market and highlighting the implications of this mechanism for consumer welfare. There is a large body of literature relating switching costs to price competition. There is also a theoretical literature relating switching costs to other dimensions of firm strategic behavior, including entry decisions: Klemperer (1988), Farrell and Shapiro (1988), Klemperer (1995), Farrell and Klemperer (2007), Klemperer (1987) and Schmidt (2010). Furthermore, switching costs are deemed theoretically important for preserving advantages to early movers: Lieberman and Montgomery (1988), Shapiro and Varian (2000), Amit and Zott (2001). However, the implications of switching costs for entry decisions have been studied less extensively empirically and measurement of first-mover advantages is sparse (Gómez and Maícas (2011)). This paper also relates to the literature measuring the importance of entry timing to firm decisions. In my setting, the source of early entry incentives is explicitly present in the demand model. I model the mechanism driving consumers' inertia and its relationship with firms' strategic behavior. There is a vast theoretical work on this topic since the early technology diffusion literature (Reinganum (1981a)), (Reinganum (1981b)) and (Fudenberg and Tirole (1985)). The empirical literature on this issue is much sparser due to the difficulty to single-out the motive driving timing from other sources of strategic behavior.