Senior Tax Breaks on the Move—but Are Seniors Actually Moving?

Every state in the United States with an income tax offers some kind of tax break to its older citizens. These breaks are often sizable, resulting in an elderly household owing substantially less in income taxes than a non-elderly household with the same income. In this brief, author Karen Smith Conway examines these state income tax breaks for the elderly, describing how they work, their distributional and revenue effects, and whether these policies affect migration. She reports that existing state income tax breaks for the elderly result in non-trivial reductions in state revenue and offer little relief to the most vulnerable elderly. Data on interstate migration yield little evidence that these tax breaks pay for themselves by inducing the elderly to remain in or move to the state. Proposed additional tax breaks would primarily benefit high-income elderly households, while the existing breaks primarily benefit middle- and high-income elderly households

The effect of landfills on rural residential property values: Some empirical evidence.

Abstract The question of whether solid waste landfills affect residential property values has long been a subject of debate. Past research has resulted in mixed conclusions. The current study examines six landfills, which differ in size, operating status, and history of contamination. The effect of each landfill is estimated by the use of multiple regression. In five of the landfills, no statistically significant evidence of an effect was found. In the remaining case, evidence of an effect was found, indicating that houses in close proximity to this landfill suffered an average loss of about six percent in value

Are Income Tax Breaks for Seniors Good for State Economic Growth?

In this brief, authors Ben Brewer, Karen Conway, and Jon Rork discuss the findings of their recently published study that investigates, directly, the impact on state economic growth of expanding income tax breaks for seniors. All state income tax systems contain provisions that reduce the state income tax burden for elderly households, and most modest-income elderly households owe little in state income taxes. Each year state legislatures consider expansions to these tax provisions, which tend to benefit primarily upper-income elderly households, with advocates suggesting such changes will be “good” for the state, in part by retaining and attracting elderly residents. Reducing the tax burden for higher-income groups—including the elderly—spurs state economic growth much less than reducing the tax burden for lower-income households. To provide economic relief to low-income elderly households, states would need to enact income-based refundable tax credits similar to the Earned Income Tax Credit available to low-income working households. The authors’ study suggests that expanding such tax credits would likely be more beneficial for economic growth

BackPack Food Programs Linked to Higher Test Scores for School Children

Nationwide, over half a million children live in households that report very low food security among children, meaning a child is not eating enough, going hungry, skipping a meal, or not eating for a full day because the household can’t afford food. School meals cannot alleviate this need outside of school hours. To mitigate food insecurity on days when free school meals are unavailable, foodbanks have partnered with schools to create weekend feeding, or “BackPack,” programs that provide children with a bag of nonperishable food to nourish them over the weekend. In this brief, authors Michael Kurtz, Karen Conway, and Robert Mohr summarize their recently published article at the Economics of Education Review, which aimed to understand how these BackPack programs relate to academic success. This research uses data from Northwestern North Carolina tracking the first adoptions and subsequent rapid growth of the BackPack program across schools there. The authors combine participation data with restricted administrative student and school data, which allow them to observe how economically disadvantaged students in schools with and without such programs performed on end-of-grade tests in reading and mathematics. Results provide strong evidence that the introduction of the BackPack program resulted in increased end-of-grade test scores for economically disadvantaged primary school students. The impacts on both reading and math appear strongest for the youngest and lowest performing students

When Random Group Effects are Cross-Correlated: An Application to Elderly Migration Flow Models

Incorporating random group effects has proven important to making correct statistical inferences about factors that only vary across groups. We note that it is possible to have more than one random effect in models using cross-sectional data and that these random effects could be correlated, unlike in the typical panel data situation. Extending the standard multiple random effects model in this way is greatly simplified by using the two-step estimator we develop. Our application to an elderly migration flow model provides an intuitive example of cross-correlated random group effects and demonstrates the ease of our estimator, as well as highlighting the empirical importance of controlling for random effects

Elderly Migration and State Fiscal Policy: Evidence from the 1990 Census Migration Flows+

The elderly’s unique economic situation makes some government expenditures more attractive and some forms of taxation less burdensome than others. This research investigates whether elderly migration is affected by state fiscal policies and discusses the possible consequences, both of which likely differ between younger and older elderly. Using state-to-state migration flows, we identify which states are gaining and losing younger versus older elderly people. We then estimate the migration flows as a function of the states’ amenities, cost of living, composition of government spending and alternative specifications of the tax system. We find that elderly migration is influenced by state fiscal policy

Ice sheet record of recent sea-ice behavior and polynya variability in the Amundsen Sea, West Antarctica

Author Posting. © American Geophysical Union, 2013. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 118 (2013): 118–130, doi:10.1029/2012JC008077.Our understanding of past sea-ice variability is limited by the short length of satellite and instrumental records. Proxy records can extend these observations but require further development and validation. We compare methanesulfonic acid (MSA) and chloride (Cl–) concentrations from a new firn core from coastal West Antarctica with satellite-derived observations of regional sea-ice concentration (SIC) in the Amundsen Sea (AS) to evaluate spatial and temporal correlations from 2002–2010. The high accumulation rate (~39 g∙cm–2∙yr–1) provides monthly resolved records of MSA and Cl–, allowing detailed investigation of how regional SIC is recorded in the ice-sheet stratigraphy. Over the period 2002–2010 we find that the ice-sheet chemistry is significantly correlated with SIC variability within the AS and Pine Island Bay polynyas. Based on this result, we evaluate the use of ice-core chemistry as a proxy for interannual polynya variability in this region, one of the largest and most persistent polynya areas in Antarctica. MSA concentrations correlate strongly with summer SIC within the polynya regions, consistent with MSA at this site being derived from marine biological productivity during the spring and summer. Cl– concentrations correlate strongly with winter SIC within the polynyas as well as some regions outside the polynyas, consistent with Cl– at this site originating primarily from winter sea-ice formation. Spatial correlations were generally insignificant outside of the polynya areas, with some notable exceptions. Ice-core glaciochemical records from this dynamic region thus may provide a proxy for reconstructing AS and Pine Island Bay polynya variability prior to the satellite era.This research was supported by an award from the Department of Energy Office of Science Graduate Fellowship Program (DOE SCGF) to ASC, a James E. and Barbara V. Moltz Research Fellowship to SBD, and by grants from NSF-OPP (#ANT-0632031 & #ANT-0631973); NSF-MRI (#EAR-1126217); NASA Cryosphere Program (#NNX10AP09G); and a WHOI Andrew W. Mellon Foundation Award for Innovative Research.2013-07-2

The complete mitochondrial genome of the foodborne parasitic pathogen Cyclospora cayetanensis

Cyclospora cayetanensis is a human-specific coccidian parasite responsible for several food and water-related outbreaks around the world, including the most recent ones involving over 900 persons in 2013 and 2014 outbreaks in the USA. Multicopy organellar DNA such as mitochondrion genomes have been particularly informative for detection and genetic traceback analysis in other parasites. We sequenced the C. cayetanensis genomic DNA obtained from stool samples from patients infected with Cyclospora in Nepal using the Illumina MiSeq platform. By bioinformatically filtering out the metagenomic reads of non-coccidian origin sequences and concentrating the reads by targeted alignment, we were able to obtain contigs containing Eimeria-like mitochondrial, apicoplastic and some chromosomal genomic fragments. A mitochondrial genomic sequence was assembled and confirmed by cloning and sequencing targeted PCR products amplified from Cyclospora DNA using primers based on our draft assembly sequence. The results show that the C. cayetanensis mitochondrion genome is 6274 bp in length, with 33% GC content, and likely exists in concatemeric arrays as in Eimeria mitochondrial genomes. Phylogenetic analysis of the C. cayetanensis mitochondrial genome places this organism in a tight cluster with Eimeria species. The mitochondrial genome of C. cayetanensis contains three protein coding genes, cytochrome (cytb), cytochrome C oxidase subunit 1 (cox1), and cytochrome C oxidase subunit 3 (cox3), in addition to 14 large subunit (LSU) and nine small subunit (SSU) fragmented rRNA genes

An \u3cem\u3eEscherichia coli\u3c/em\u3e Nissle 1917 Missense Mutant Colonizes the Streptomycin-Treated Mouse Intestine Better than the Wild Type but Is Not a Better Probiotic

Previously we reported that the streptomycin-treated mouse intestine selected for two different Escherichia coli MG1655 mutants with improved colonizing ability: nonmotile E. coli MG1655 flhDC deletion mutants that grew 15% faster in vitro in mouse cecal mucus and motile E. coli MG1655 envZ missense mutants that grew slower in vitro in mouse cecal mucus yet were able to cocolonize with the faster-growing flhDC mutants. The E. coli MG1655 envZ gene encodes a histidine kinase that is a member of the envZ-ompR two-component signal transduction system, which regulates outer membrane protein profiles. In the present investigation, the envZ P41L gene was transferred from the intestinally selected E. coli MG1655 mutant to E. coli Nissle 1917, a human probiotic strain used to treat gastrointestinal infections. Both the E. coli MG1655 and E. coli Nissle 1917 strains containing envZ P41L produced more phosphorylated OmpR than their parents. The E. coli Nissle 1917 strain containing envZ P41L also became more resistant to bile salts and colicin V and grew 50% slower in vitro in mucus and 15% to 30% slower on several sugars present in mucus, yet it was a 10-fold better colonizer than E. coli Nissle 1917. However, E. coli Nissle 1917 envZ P41L was not better at preventing colonization by enterohemorrhagic E. coli EDL933. The data can be explained according to our “restaurant” hypothesis for commensal E. coli strains, i.e., that they colonize the intestine as sessile members of mixed biofilms, obtaining the sugars they need for growth locally, but compete for sugars with invading E. coli pathogens planktonically

Glycogen and Maltose Utilization by \u3cem\u3eEscherichia coli\u3c/em\u3e O157:H7 in the Mouse Intestine

Mutant screens and transcriptome studies led us to consider whether the metabolism of glucose polymers, i.e., maltose, maltodextrin, and glycogen, is important for Escherichia coli colonization of the intestine. By using the streptomycin-treated mouse model, we found that catabolism of the disaccharide maltose provides a competitive advantage in vivo to pathogenic E. coli O157:H7 and commensal E. coli K-12, whereas degradation of exogenous forms of the more complex glucose polymer, maltodextrin, does not. The endogenous glucose polymer, glycogen, appears to play an important role in colonization, since mutants that are unable to synthesize or degrade glycogen have significant colonization defects. In support of the hypothesis that E. coli relies on internal carbon stores to maintain colonization during periods of famine, we found that by providing a constant supply of a readily metabolized sugar, i.e., gluconate, in the animal\u27s drinking water, the competitive disadvantage of E. coli glycogen metabolism mutants is rescued. The results suggest that glycogen storage may be widespread in enteric bacteria because it is necessary for maintaining rapid growth in the intestine, where there is intense competition for resources and occasional famine. An important implication of this study is that the sugars used by E. coli are present in limited quantities in the intestine, making endogenous carbon stores valuable. Thus, there may be merit to combating enteric infections by using probiotics or prebiotics to manipulate the intestinal microbiota in such a way as to limit the availability of sugars preferred by E. coli O157:H7 and perhaps other pathogens