Choosing between his time and her time? Paid and unpaid work of Danish couples

In terms of paid and unpaid work, Danish men and women work the same number of hours per week. But while men do most paid work, women do most unpaid work. We investigate the interaction between paid work and unpaid work for Danish working couples, using the 2001 Danish Time Use Survey. We test several competing theories regarding the intra-individual and intra-household allocation of paid and unpaid work: comparative advantage, bargaining, assortative mating and ‘doing gender’. In addition, we divide unpaid work into ordinary housework and childcare and analyse whether these two activities interact differently with paid work hours. In general, the results favour the assortative mating and ‘doing gender’ theories, but do not support the bargaining or comparative advantage theories. Furthermore, results clearly show that housework and childcare are separate activities with different interaction effects.Labour supply, paid and unpaid work, intra-household allocation of time

"Time and Money: Substitutes in Real Terms and Complements in Satisfactions"

Time and money are basic commodities in the utility function and are substitutes in real terms. To a certain extent, having time and money is a matter of either/or, depending on individual preferences and budget constraints. However, satisfaction with time and satisfaction with money are typically complements, i.e., individuals tend to be equally satisfied with both domains. In this paper, we provide an explanation for this apparent paradox through the analysis of the simultaneous determination of economic satisfaction and leisure satisfaction. We test some hypotheses, including the hypothesis that leisure satisfaction depends on both the quantity and quality of leisure-where quality is proxied by good intensiveness and social intensiveness. Our results show that both the quantity and the quality of leisure are important determinants of leisure satisfaction, and, since having money contributes to the quality of leisure, this explains the empirical findings of the satisfactions being complementary at the same time as the domains are substitutes. Interestingly, gender matters. Intra-household effects and especially individual characteristics are more pronounced for women than for men for both domain satisfactions. Additionally, good intensiveness is more important for men (e.g., housing conditions), whereas social intensiveness is more important for women (e.g., the presence of children and participation in leisure-time activities).

Medium-term consequences of low birth weight on health and behavioral deficits – is there a catch-up effect?

A number of studies have documented negative long term effects of low birth weight. Yet, not much is known about the dynamics of the process leading to adverse health and educational outcomes in the long-run. While some studies find effects of the same size at both school age and young adulthood, others find a diminishing negative effect over time due to a catching-up process. The purpose of this paper is to try to resolve this puzzle by analyzing the medium term consequences of low birth weight measured as various child outcomes at ages 6 months, 3, 7 and 11, using data from the Danish Longitudinal Survey of Children. Observing the same children at different points in time allows us to chart the evolution of health and behavioral deficits among children born with low birth weight and helps inform the nature and timing of interventionslow birth weight; medium term effects; health and behavioral outcomes; longitudinal child-mother survey

Toward quantum processing in molecules: A THz-bandwidth coherent memory for light

The unusual features of quantum mechanics are enabling the development of technologies not possible with classical physics. These devices utilize nonclassical phenomena in the states of atoms, ions, and solid-state media as the basis for many prototypes. Here we investigate molecular states as a distinct alternative. We demonstrate a memory for light based on storing photons in the vibrations of hydrogen molecules. The THz-bandwidth molecular memory is used to store 100-fs pulses for durations up to 1ns, enabling 10,000 operational time bins. The results demonstrate the promise of molecules for constructing compact ultrafast quantum photonic technologies.Comment: 5 pages, 3 figures, 1 tabl