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51.
This paper examines the investments and performance of community development venture capital (CDVC). We find substantial differences between CDVCs and traditional VCs: CDVC investments are far more likely to be in nonmetropolitan regions and in regions with little prior venture activity. CDVC investments are likely to be in earlier stage investments and in industries outside the venture capital mainstream that have lower probabilities of successful exit. Even after controlling for this unattractive transaction mixture, the probability of a CDVC investment being successfully exited is lower. One benefit of CDVCs may be their effect in bringing traditional VCs to underserved regions—controlling for the presence of traditional VC investments, each additional CDVC investment results in an additional 0.06 new traditional VC firms in a region.  相似文献   
52.
    
Abstract

Background and aims: Patients with acute intermittent porphyria (AIP) may suffer from acute non-specific attacks that often result in hospitalizations or emergency room (ER) visits. Prior to the recent approval of givosiran (November 2019), hemin was the only FDA-approved therapy for AIP attacks in the US. Our aim was to estimate the annual healthcare utilization and expenditures for AIP patients treated with hemin using real-world data.

Methods: Patients with ≥1 hemin claim and confirmed AIP diagnosis – 1 inpatient claim or 2 outpatient claims ≥30 d apart for AIP (2015–2017) or acute porphyria (prior to 2015) – were identified in MarketScan administrative claims dataset between 2007 and 2017. Continuous enrolment for ≥6 months from confirmed diagnosis was required. A secondary analysis (“active disease population”) limited the sample to adult patients with ≥3 attacks or 10 months of prophylactic use of hemin within a 12-month pre-index period. AIP-related care was defined by hemin use during an attack (daily glucose and/or hemin use) or prophylaxis (non-attack hemin use). Outcomes were annualized and expenditures were inflated to 2017.

Results: Across 10 years, patients with a confirmed AIP diagnosis (N?=?8,877) and ≥1 hemin claim (N?=?164) were restricted by ≥6 months continuous follow-up (N?=?139). AIP patients were mostly female (N?=?112; 81%), had median age of 40 and 3 years average follow-up. Annualized average total expenditures for AIP-related care were $113,477. Annualized average all-cause (any diagnosis) hospitalizations were statistically significantly lower for patients treated with hemin prophylaxis vs. acute treatment (1.0 vs. 2.1; p?<?.001). In the secondary analysis (N?=?27), annualized average total expenditures for AIP-related care were higher ($187,480).

Conclusions: For AIP patients treated with hemin, patients treated for acute attacks may use a greater number of resources compared to patients treated prophylactically.  相似文献   
53.
Existing foreign aid databases – the OECD’s CRS data and now AidData – are project-based. And yet nearly all empirical analyses using these data aggregate to the country-year level, thereby losing project-specific information. In this paper, we introduce new data on the geographic location of aid projects that have been committed to many African countries between 1989 and 2008. The data enable an examination of project-level information in a wider variety of systematic research contexts. To demonstrate the utility of the new data, we discuss how geographically disaggregated foreign aid and armed conflict data are needed to capture the theoretical mechanisms in the aid-conflict literature. We then map the disaggregated aid and conflict data in Sierra Leone, Angola, and Mozambique as specific examples of how these data could help disentangle competing causal mechanisms linking aid to conflict onset and dynamics. The research provides an important new perspective on the connections between aid and conflict. More generally, it is a crucial first step in geo-referencing and comparing foreign aid projects to various localized development outcomes.  相似文献   
54.
The cost of child care is one of the greatest financial barriers faced by mothers returning to work. In recognition of this cost, the federal government provides child care subsidies to assist families to meet the cost of child care.
This paper models the use of child care services and the provision of child care subsidies to determine how effective the Australian government child care support programs are in reducing the financial barriers that make returning to work difficult for many mothers. Both childcare assistance and the newer childcare cash rebate are modelled. The impact of these assistance measures is examined for couples and sole parents on different incomes with one or two children in child care.
It was found that child care subsidies are highly progressive and make a substantial contribution to vertical equity by offsetting child care costs related to employment. They also contribute to horizontal equity, by providing greater assistance in meeting child care costs for families with more than one child in care, in recognition of their greater need. Sole parents derived the greatest benefit from child care subsidies, particularly those on low incomes working full-time and with two children in care.  相似文献   
55.
Fink  Eugene  Johnson  Josh  Hu  Jenny 《NETNOMICS》2004,6(1):21-42
The modern economy includes a variety of markets, and the Internet has opened opportunities for efficient on-line trading. Researchers have developed algorithms for various auctions, which have become a popular means of on-line sales. They have also designed algorithms for exchange markets, which support fast-paced trading of standardized goods. On the other hand, they have done little work on exchanges for complex nonstandard goods, such as used cars. We propose a formal model for trading complex goods, and present an exchange system that allows traders to describe desirable purchases and sales by multiple attributes; for example, a car buyer can specify a model, options, color, and other properties of a desirable vehicle. Furthermore, a trader can enter complex constraints on the acceptable items; for instance, a buyer can specify a set of desirable vehicles and their features. The system supports markets with up to 260,000 orders, and generates hundreds of trades per second.  相似文献   
56.
Endogenous firm heterogeneity and the dynamics of trade liberalization   总被引:1,自引:0,他引:1  
In this paper, we build a dynamic model with endogenous firm-level productivity that involves ex ante identical firms behaving differently in equilibrium. Heterogeneity arises in equilibrium as firms choose different dates to adopt a new technology. We investigate the effects of international trade on technological diffusion and show that trade has a generally positive impact on the equilibrium rate of adoption (and hence on firm-level productivity). In addition, the model can replicate the stylized fact that exporters are larger and more productive than non-exporters. Finally, we show how our model can be used to interpret the emerging empirical evidence on the firm-level productivity effects of CUSFTA.  相似文献   
57.
The economics of partnerships have been of enduring interest to economists, yet it is not clear what profit sharing within a private partnership should look like. We examine over 700 private equity partnerships and show that the allocation of fund economics to individual partners varies drastically, even among the most senior partners, and appears divorced from past success as an investor, being instead related to status as a founder. A smaller share of carried interest and ownership—and inequality in fund economics more generally—is associated with departures of senior partners which, in turn is negatively related to the funds’ ability to raise additional capital.  相似文献   
58.
    
This paper reports estimates of the elasticity of taxable income with respect to the net‐of‐tax rate for New Zealand taxpayers. The relative stability of the New Zealand personal income tax system, in terms of marginal rates, thresholds and the tax base, provides helpful conditions for deriving these estimates. The elasticity of taxable income was estimated to be substantially higher for the highest income groups. Changes in the timing of income flows for the higher income recipients were found to be an important response to the announcement of a new higher rate bracket. The marginal welfare costs of personal income taxation were consistent across years, being relatively small for all but the higher tax brackets. For the top marginal rate bracket of 39 per cent, the welfare cost of raising an extra dollar of tax revenue was estimated to be well in excess of a dollar. Implications of the findings are that: disincentive effects of high top marginal rates can be substantial even when labour supply responses are small; the welfare costs of increases in top marginal tax rates can be high; and announcement effects of tax policy changes can lead to considerable income shifting between time periods.  相似文献   
59.
60.
    
The U.S. healthcare sector is a large and important industry. However, relatively little is known about the localization and colocalization patterns of healthcare services within an urban area. By using Yelp data from over 3000 healthcare service establishments in the Phoenix area, this paper applies a recent spatial econometric technique to the analysis of healthcare services. The results reveal that spatial concentration varies across distances and types of healthcare services. Localization is more prevalent at closer distances, and general practitioners tend to be more dispersed than specialists. Colocalization with hospitals is most likely for specialists while family practices and dentistry services tend to locate away from hospitals. Different types of location patterns across different types of healthcare services are relevant for informing policies addressing healthcare access and competition in healthcare markets.  相似文献   
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