10,721 research outputs found
Flexibility at the margin and labor market volatility in OECD countries
We argue that segmented labor markets with flexibility at the margin (e.g., just affecting
fixed-term employees) may achieve similar volatility than fully deregulated labor
markets. Flexibility at the margin produces a gap in separation costs among matched
workers that cause fixed-term employment to be the main workforce adjustment
device. Moreover, in the presence of limitations in the duration and number of renewals
of fixed-term contracts, firms respond by fostering labor turnover which further raises
the volatility of the labor market. We present a matching model with temporary and
permanent jobs where (i) the gap in firing costs and (ii) restrictions in the use of fixedterm
contracts play the central role to explain the similar volatility observed in many
regulated labor markets with flexibility at the margin vis-Ă -vis the fully deregulated
ones
Kinetic and Exchange Energy Densities near the Nucleus
We investigate the behavior of the kinetic and the exchange energy densities
near the nuclear cusp of atomic systems. Considering hydrogenic orbitals, we
derive analytical expressions near the nucleus, for single shells, as well as
in the semiclassical limit of large non-relativistic neutral atoms. We show
that a model based on the helium iso-electronic series is very accurate, as
also confirmed by numerical calculations on real atoms up to two thousands
electrons. Based on this model, we propose non-local density-dependent
ingredients that are suitable for the description of the kinetic and exchange
energy densities in the region close to the nucleus. These non-local
ingredients are invariant under the uniform scaling of the density, and they
can be used in the construction of non-local exchange-correlation and kinetic
functionals.Comment: 11 pages, 7 figure
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