Adam Sacarny

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We introduce the class of conditional linear combination tests, which reject null hypotheses concerning model parameters when a data-dependent convex combination of two identification-robust statistics is large. These tests control size under weak identification and have a number of optimality properties in a conditional problem. We show that the(More)
Exploring how the release of new economic data affects asset prices in the stock, bond, and foreign exchange markets, the authors find that only a few announcements—the nonfarm payroll numbers, the GDP advance release, and a private sector manufacturing report—generate price responses that are economically significant and measurably persistent. Bond yields(More)
The conventional wisdom in health economics is that idiosyncratic features of the healthcare sector leave little scope for market forces to allocate consumers to higher performance producers. However, we find robust evidence across a variety of conditions and performance measures that higher quality hospitals tend to have higher market shares at a point in(More)
The Affordable Care Act (ACA) dramatically expanded the use of regulated marketplaces in health insurance, but consumers often fail to shop for plans during open enrollment periods. Typically these consumers are automatically reenrolled in their old plans, which potentially exposes them to unexpected increases in their insurance premiums and cost sharing.(More)
I study the relationship between bank-specific capital and credit access in a new setting: bank branch closings in markets where the branch network is dense. Existing regulation in the U.S. is targeted toward areas with few branches where closings inhibit physical access to the branch network. I show that, even in crowded markets, closings can have large(More)
The rapid growth of Political Action Committees – expenditures neared $500 million in the 2012 presidential election – is center-stage in the debate over money in American politics. The effect of PACs on elections depends on regulation and its interaction with imperfect competition. Congress requires stations to treat candidates to the same office equally,(More)
The conventional wisdom for the healthcare sector is that idiosyncratic features leave little scope for market forces to allocate consumers to higher performance producers. However, we find robust evidence - across several different conditions and performance measures - that higher quality hospitals have higher market shares and grow more over time. The(More)
Inappropriate prescribing is a rising threat to the health of Medicare beneficiaries and a drain on Medicare's finances. In this study we used a randomized controlled trial approach to evaluate a low-cost, light-touch intervention aimed at reducing the inappropriate provision of Schedule II controlled substances in the Medicare Part D program. Potential(More)
Private school market shares are rising steadily in many developing countries, but we have a limited understanding of how private schools set prices, how parents respond, and how this affects enrollment and performance in equilibrium. To shed light on demand behavior and supply response, I present a model of school pricing that incorporates an unusual(More)