24,807 research outputs found
Did PROGRESA send drop-outs back to school?
This paper analyzes the effect of PROGRESA education grants on school enrollment. It looks at
its effect on total school enrollment and in particular on school enrollment of drop-outs, i.e.
those children who face a re-enrollment decision since they were not enrolled in school the year
prior to the implementation of the PROGRESA program. Estimates of the impact of
PROGRESA education grants on drop-outs and non-drop-outs are obtained applying difference
estimation and maximum likelihood estimation of a reduced form equation for schooling
decision. Differences in results between both groups of children are discussed looking at the
distribution of marginal effects. PROGRESA did send drop-outs back to school. It had a larger
effect on drop-outs than on non-drop-outs. However, for the particular group of girls who
dropped out of school just before attending secondary school PROGRESA grants only had a
minor effect. This last finding highlights the fact that determinants of the schooling decision are
different for young girls and that PROGRESA grants do not provide a strong enough incentive
to send them back to school
Reflections of the way life used to be: anthropology, history and the decline of the fish stocks in Puerto Rico
Pricing and Marketing Rules with Brand Loyalty
Many firms face a dynamic trade-off: if price is reduced, the firm attracts new customers who will yield profits in the future, but it also forgoes the opportunity to squeeze profits now from loyal customers. This paper identifies a rule that represents the optimal resolution of this trade-off, in terms of an intuitive modification to the static Lerner rule. We find that the âeffectiveâ price elasticity depends on the discount rate used by the firm, on the rate of depreciation of the clientele through exit from the stock of repeat purchasers, and on a weighted sum of the price elasticities of the flow of entries into the stock of repeat-purchasers and the flow of exits from the stock of repeat-purchasers. None of these factors enter the optimal pricing strategy for a firm facing a conventional demand function with instantaneous adjustment, i.e. where consumers are âfast switchersâ, rather than repeat-purchasers. We also find optimal rules for marketing investment and for quality of service, which are extensions of the Dorfman-Steiner conditions. The paper shows that our rules, with suitable modifications, are valid for many market structures, including monopolistic competition, pure monopoly and strong cartels, dominant firms and oligopolists that have full commitment ability. In the case of dominant firms and oligopolists that cannot commit to their strategy paths, these simple optimal pricing and marketing rules do not apply.
A Theory of Noncontributory Pension Design
Noncontributory subsidies for the old poor (first-pillar pensions) affect the welfare of hundreds of millions around the world. Their benevolent rationale is to redistribute progressively, subject to efficiency considerations. This paper focuses on a critical efficiency issue: first pillars may affect another, even bigger program, namely contributory pensions for the middle classes, by inducing a reduction in the density of contributions. A major source of concern with contributory pensions in emerging economies is that the total replacement rate is too small for participants with low density, which are prevalent. The paper develops a model where density of contribution is endogenous, because for a substantial subset of jobs, the State is unable or unwilling to impose a mandate to contribute. Thus, the job selection decision is bundled with a saving decision. The first finding is that bundling modifies the effective rate of return on contributions, raising it without bound as earnings in uncovered jobs become smaller (relative to earnings in covered jobs). Another finding is that the standard designs of first-pillar pensions reduce the equilibrium density of contributions. Thus, standard first-pillar designs do crowd out contributory pensions for the middle classes. The paper then analyzes two second-generation designs. The âproportionalâ minimum pension is found to create horizontal inequity and inefficiency. In contrast, a subsidy with a small withdrawal rate applied to contributory pensions minimizes the loss of contribution density. Optimal income taxation theory suggests that the latter also provides the most efficient progressive redistribution.Social security, pensions, density
Discrete Fourier Transform Improves the Prediction of the Electronic Properties of Molecules in Quantum Machine Learning
High-throughput approximations of quantum mechanics calculations and
combinatorial experiments have been traditionally used to reduce the search
space of possible molecules, drugs and materials. However, the interplay of
structural and chemical degrees of freedom introduces enormous complexity,
which the current state-of-the-art tools are not yet designed to handle. The
availability of large molecular databases generated by quantum mechanics (QM)
computations using first principles open new venues for data science to
accelerate the discovery of new compounds. In recent years, models that combine
QM with machine learning (ML) known as QM/ML models have been successful at
delivering the accuracy of QM at the speed of ML. The goals are to develop a
framework that will accelerate the extraction of knowledge and to get insights
from quantitative process-structure-property-performance relationships hidden
in materials data via a better search of the chemical compound space, and to
infer new materials with targeted properties. In this study, we show that by
integrating well-known signal processing techniques such as discrete Fourier
transform in the QM/ML pipeline, the outcomes can be significantly improved in
some cases. We also show that the spectrogram of a molecule may represent an
interesting molecular visualization tool.Comment: 4 pages, 3 figures, 2 tables. Accepted to present at 32nd IEEE
Canadian Conference in Electrical Engineering and Computer Scienc
Nonfractional Memory: Filtering, Antipersistence, and Forecasting
The fractional difference operator remains to be the most popular mechanism
to generate long memory due to the existence of efficient algorithms for their
simulation and forecasting. Nonetheless, there is no theoretical argument
linking the fractional difference operator with the presence of long memory in
real data. In this regard, one of the most predominant theoretical explanations
for the presence of long memory is cross-sectional aggregation of persistent
micro units. Yet, the type of processes obtained by cross-sectional aggregation
differs from the one due to fractional differencing. Thus, this paper develops
fast algorithms to generate and forecast long memory by cross-sectional
aggregation. Moreover, it is shown that the antipersistent phenomenon that
arises for negative degrees of memory in the fractional difference literature
is not present for cross-sectionally aggregated processes. Pointedly, while the
autocorrelations for the fractional difference operator are negative for
negative degrees of memory by construction, this restriction does not apply to
the cross-sectional aggregated scheme. We show that this has implications for
long memory tests in the frequency domain, which will be misspecified for
cross-sectionally aggregated processes with negative degrees of memory.
Finally, we assess the forecast performance of high-order and
models when the long memory series are generated by cross-sectional
aggregation. Our results are of interest to practitioners developing forecasts
of long memory variables like inflation, volatility, and climate data, where
aggregation may be the source of long memory
The school reentry decision on poor girls: structural estimation and policy analysis using PROGRESA database
In this paper I present a dynamic structural model of girls' schooling choices and estimate it using the Mexican PROGRESA database. This structural approach allows evaluating the efectiveness of several policies to increase school reentry rates for girls in low-income households. To increase school attendance among poor children in developing countries, policy makers have implemented conditional cash transfers programs. Although transfers have been successful in keeping girls at school, they do not increase school attendance among girls who have dropped out of school. Cash transfer programs may fail because most of these poor girls leave school to stay at home helping in housework, rather than working for a salary. Results suggest that effective policies to increase school reentry rates for poor girls are free access to community nurseries and kindergartens, and increasingg the availability of secondary schools.Policy evaluation, Dynamic discrete choice structural models, School choices for girls, School reentry, PROGRESA
The 2008 Chilean Reform to First-Pillar Pensions
Chile approved in early 2008 the replacement of her two current non-contributory subsidies for the old poor for a unified program with a pioneering design, with phase-in ending in 2012. This paper describes the political economy of this reform and evaluates it with regards to efficiency and equity. The design is analogous to one adopted in Finland in 1957, with two differences: First, the subsidy withdrawal rate in response to the individualâs contributory pension benefit is lower, about 30% rather than 50%. Second, preserving a tradition introduced in 1975, benefits are also withdrawn in response to per capita household income.social security, welfare programs, political economy of reform
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