36,831 research outputs found
Life, The Universe, and Nothing: Life and Death in an Ever-Expanding Universe
Current evidence suggests that the cosmological constant is not zero, or that
we live in an open universe. We examine the implications for the future under
these assumptions, and find that they are striking. If the Universe is
cosmological constant-dominated, our ability to probe the evolution of large
scale structure will decrease with time ---presently observable distant sources
will disappear on a time-scale comparable to the period of stellar burning.
Moreover, while the Universe might expand forever, the integrated conscious
lifetime of any civilization will be finite, although it can be astronomically
long. We find that this latter result is far more general. In the absence of
possible exotic and uncertain strong gravitational effects, the total
information recoverable by any civilization over the entire history of our
universe is finite, and assuming that consciousness has a physical
computational basis, life cannot be eternal.Comment: 23 pages, latex, submitted to Ap.
Universal Limits on Computation
The physical limits to computation have been under active scrutiny over the
past decade or two, as theoretical investigations of the possible impact of
quantum mechanical processes on computing have begun to make contact with
realizable experimental configurations. We demonstrate here that the observed
acceleration of the Universe can produce a universal limit on the total amount
of information that can be stored and processed in the future, putting an
ultimate limit on future technology for any civilization, including a
time-limit on Moore's Law. The limits we derive are stringent, and include the
possibilities that the computing performed is either distributed or local. A
careful consideration of the effect of horizons on information processing is
necessary for this analysis, which suggests that the total amount of
information that can be processed by any observer is significantly less than
the Hawking-Bekenstein entropy associated with the existence of an event
horizon in an accelerating universe.Comment: 3 pages including eps figure, submitted to Phys. Rev. Lett; several
typos corrected, several references added, and a short discussion of w <-1
adde
ILR Impact Brief - The Sources of International Differences in Wage Inequality
Wage inequality in the U.S. exceeds that of Canada, Denmark, Finland, Italy, Netherlands, Norway, Sweden, and Switzerland. Some researchers have pointed to the higher relative rewards for higher cognitive skill and more education in the U.S. as an important cause of this difference; others emphasize the greater diversity of labor market skills within the American population. This paper uses recently collected international data on cognitive skills, earnings, age, and years of formal schooling to assess the relative importance of population heterogeneity and higher relative pay for more cognitive skill in explaining higher U.S. wage inequality
Do Cognitive Test Scores Explain Higher US Wage Inequality?
Using microdata from the 1994-6 International Adult Literacy Survey (IALS), we examine the role of cognitive skills in explaining higher wage inequality in the US. We find that while the greater dispersion of cognitive test scores in the US plays a part in explaining higher US wage inequality, higher labor market prices (i.e., higher returns to measured human capital and cognitive performance) and greater residual inequality still play important roles for both men and women. And we find that, on average, prices are quantitatively considerably more important than differences in the distribution of test scores in explaining the relatively high level of US wage inequality. This finding holds up when we examine natives only and when we correct for sample selection.
The Feasibility and Importance of Adding Measures of Actual Experience to Cross-Sectional Data Collection
We use Michigan Panel Study of Income Dynamics data and data from a 2008 telephone survey of adults conducted by Westat for the Princeton Data Improvement Initiative (PDII) to explore the importance and feasibility of adding retrospective questions about actual work experience to cross-sectional data sets. We demonstrate that having such actual experience data is important for analyzing women's post-school human capital accumulation, residual wage inequality, and the gender pay gap. Further, our PDII survey results show that it is feasible to collect actual experience data in cross-sectional telephone surveys like the March Current Population Survey annual supplement.gender, microeconomic data collection, work experience, human capital
Changes in the Labor Supply Behavior of Married Women: 1980-2000
Using March Current Population Survey (CPS) data, we investigate married women's labor supply behavior from 1980 to 2000. We find that their labor supply function for annual hours shifted sharply to the right in the 1980s, with little shift in the 1990s. In an accounting sense, this is the major reason for the more rapid growth of female labor supply observed in the 1980s, with an additional factor being that husbands' real wages fell slightly in the 1980s but rose in the 1990s. Moreover, a major new development was that, during both decades, there was a dramatic reduction in women's own wage elasticity. And, continuing past trends, women's labor supply also became less responsive to their husbands' wages. Between 1980 and 2000, women's own wage elasticity fell by 50 to 56 percent, while their cross wage elasticity fell by 38 to 47 percent in absolute value. These patterns hold up under virtually all alternative specifications correcting for: selectivity bias in observing wage offers; selection into marriage; income taxes and the earned income tax credit; measurement error in wages and work hours; and omitted variables that affect both wage offers and the propensity to work; as well as when education groups and mothers of small children are analyzed separately.
Gender and Youth Employment Outcomes: The US and West Germany, 1984-91
This paper examines gender differences in labor market outcomes for hard-to-employ youth in the US and West Germany during the 1984-91 period. We find that young, less educated American men and especially women are far less likely to be employed than their German counterparts. Moreover, less educated young women and men in the United States have lower earnings relative to more highly educated youth in their own country, and also fare much worse than less educated German youth in absolute terms, correcting for purchasing power. The relatively high employment rates of less educated German youth combined with their relatively high wages raise the question of how they are successfully absorbed into the labor market. We present evidence that the large public sector in Germany in effect functions as an employer of last resort, absorbing some otherwise unemployable low skilled youth. Our findings also suggest that the US welfare system accounts for very little of the US-German difference in employment rates.
USE OF CONSERVATION RESERVE PROGRAM LAND FOR BIOREFINERY FEEDSTOCK PRODUCTION
Legislation passed in 2002 enables managed harvesting and grazing of Conservation Reserve Program (CRP) land, including harvesting of biomass. The objective of the research is to determine the cost to acquire, harvest, store, and deliver a steady flow of biomass from CRP grasslands to a biorefinery.Resource /Energy Economics and Policy,
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