منابع مشابه
Why Do Household Portfolio Shares Rise in Wealth?∗
In the cross-section of households, the portfolio share rises in wealth and has a non-decreasing age profile. The standard life-cycle model with homothetic utility and non-tradable labor income has the counterfactual implication that the portfolio share falls in both wealth and age. We develop a life-cycle model in which households have nonhomothetic utility over two types of consumption goods,...
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Our improved understanding of the disorder and increasingly sensitive diagnostic tools are playing a role—but so are some other factors. Robert G. Zylstra, EdD, LCSW; Christopher D. Prater, MD, FAAFP, DABAM; Amy E. Walthour, MD, PhD; Alexandra Feliciano Aponte, MD Department of Family Medicine, The University of Tennessee College of Medicine, Chattanooga (Drs. Zylstra, Prater, and Walthour); Ma...
متن کاملWhy do leafcutter bees cut leaves? New insights into the early evolution of bees.
Stark contrasts in clade species diversity are reported across the tree of life and are especially conspicuous when observed in closely related lineages. The explanation for such disparity has often been attributed to the evolution of key innovations that facilitate colonization of new ecological niches. The factors underlying diversification in bees remain poorly explored. Bees are thought to ...
متن کاملWhy Are Bonsai Leaves Small?
where they make those critical decisions that govern their lives. You who garden certainly know that plants have a mind of their own. Given that humans, and the majority of animals, solve many of their stressful problems (say, hunger) with a change in behavior (foraging for food), where are these decisions made in plants? An intriguing, and visually pleasing, example of such decision-making can...
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ژورنال
عنوان ژورنال: Plant Physiology
سال: 2019
ISSN: 0032-0889,1532-2548
DOI: 10.1104/pp.19.00446