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Of all publications in the section: 3 520
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Working paper
Orel E., Kochergina E. V., Nye J. V. PSYCHOLOGY. WP BRP. Издательский дом НИУ ВШЭ, 2013
  We study which Big Five personality traits are associated with academic performance among a sample of Russian university students using results from the Unified State Examination (for university admissions) and their current grade point averages as measures of academic performance. We find that Introversion, Agreeableness, Neuroticism, and Openness to experience have observable ties to academic performance. Those results partially confirm existing international studies, but our findings are notable for the relative unimportance of  conscientiousness for success in our Russian sample. We suggest that cross-cultural differences  in educational environment may explain why this trait seems less obviously important in the analysis.
Added: May 20, 2013
Working paper
Ivan Cheltsov, Park J. arxiv.org. math. Cornell University, 2013
We prove that every quasi-smooth hypersurface in the 95 families of weighted Fano threefold hypersurfaces is birationally rigid.
Added: Dec 27, 2013
Working paper
Polishchuk A., Johnson D. math. arxive. Cornell University, 2018
We study birational projective models of M_2,2 obtained from the moduli space of curves with nonspecial divisors. We describe geometrically which singular curves appear in these models and show that one of them is obtained by blowing down the Weierstrass divisor in the moduli stack of Z-stable curves \bar{M}_2,2(Z) defined by Smyth. As a corollary, we prove projectivity of the coarse moduli space \bar{M}_2,2(Z).
Added: Dec 6, 2018
Working paper
Prokhorov Y., Duncan A., Cheltsov I. et al. math. arxive. Cornell University, 2019
We study the complexity of birational self-maps of a projective threefold X by looking at the birational type of surfaces contracted. These surfaces are birational to the product of the projective line with a smooth projective curve. We prove that the genus of the curves occuring is unbounded if and only if X is birational to a conic bundle or a fibration into cubic surfaces. Similarly, we prove that the gonality of the curves is unbounded if and only if X is birational to a conic bundle.
Added: Jun 8, 2019
Working paper
Vladimir L. Popov. arxiv.org. math. Cornell University, 2015. No. 1502.02167.
According to the classical theorem, every irreducible algebraic variety endowed with a nontrivial rational action of a connected linear algebraic group is birationally isomorphic to a product of another algebraic variety and the s-dimensional projectice space with positive s. We show that the classical proof of this theorem actually works only in characteristic 0 and we give a characteristic free proof of it. To this end we prove and use a characterization of connected linear algebraic groups G with the property that every rational action of G on an irreducible algebraic variety is birationally equivalent to a regular action of G on an affine algebraic variety.
Added: Feb 10, 2015
Working paper
Schnittke E. Linguistics. WP BRP. НИУ ВШЭ, 2014. No. 9.
Added: Nov 10, 2014
Working paper
Sakevich Victoria I., Denisov B. P. Sociology. SOC. Высшая школа экономики, 2014. No. WP BRP 42/SOC/2014.
The paper considers the changes in major proximate determinants of fertility in Russia within the framework of demographic transition theory and Bongaarts approach to fertility analysis. After World War II Russian fertility became fully controlled process. The complex interplay of abortion and contraception during the Soviet period resulted in a very high abortion level. Russian government has almost never supported and promoted family planning as alternative to abortion. However couple's preferences of small offspring appeared more powerful than the will of authorities. Current trends show that albeit lack of governmental support the society itself is evolving towards more humanistic and effective birth control. Estimates made upon recent surveys' data confirm the validity of official statistics and thus the reality of favorable trend of abortion decline.
Added: May 13, 2014
Working paper
Podkolzina E., Voytova T. I. Public Administration. PA. Высшая школа экономики, 2011. No. 01.
The main goal of public procurement reform in Russia, initiated in 2005, was to prevent corrupt deals between suppliers and procurers. That is why the public procurement law favors formal mechanisms to govern most of the stages of procurement: the procurer is not allowed to take into account the reputation of the supplier when he announces calls for bids and selects the supplier, and he is prescribed to use the legal system (courts) if he is not satisfied with the contract performance. Since the efficiency of formal institutions is not very high, these mechanisms are complemented by a “formalized informal instrument” - blacklisting opportunistic suppliers, which is believed to substitute for reputation mechanisms when formal mechanisms are weak. In this paper, we show how and why the institutional environment in Russia makes the blacklisting of opportunistic suppliers irrelevant. We explore how the percentage of contract breaches out of the total number of signed contracts is related to corruption and transparency measures for Russian regions. We also argue that such factors as measurement costs, verification costs, length of contracts and lawsuit amounts influence the probability of winning a legal action for a contract breach.
Added: Aug 27, 2012
Working paper
Muravyev Alexander. IZA Discussion Paper. IZA, 2016. No. 10436.
This paper provides new evidence on the structure, dynamics and performance effects of corporate boards in publicly traded companies in Russia. It takes advantage of a new and unique longitudinal dataset of virtually all Russian companies whose shares were traded in the RTS/MICEX/MOEX over 1998-2014. The analysis highlights a number of strong trends in the evolution of boards of directors, such as the declining participation of insider directors and the increasing participation of foreign and female directors. It also shows that board characteristics are linked to company performance (the market-to-book ratio, Tobin’s Q, ROE and ROA), suggesting that boards of directors play a non-trivial role in corporate governance in Russia. Testing for structural breaks in the relationship between board composition and firm performance provides some evidence of the changing role of corporate boards over time.
Added: Jan 12, 2017
Working paper
Kaledin D. B. arxiv.org. math. Cornell University, 2015
We give a simple construction of the correspondence between square-zero extensions R′ of a ring R by an R-bimodule M and second MacLane cohomology classes of R with coefficients in M (the simplest non-trivial case of the construction is R=M=Z/p, R′=Z/p2, thus the Bokstein homomorphism of the title). Following Jibladze and Pirashvili, we treat MacLane cohomology as cohomology of non-additive endofunctors of the category of projective R-modules. We explain how to describe liftings of R-modules and complexes of R-modules to R′ in terms of data purely over R. We show that if R is commutative, then commutative square-zero extensions R′ correspond to multiplicative extensions of endofunctors. We then explore in detail one particular multiplicative non-additive endofunctor constructed from cyclic powers of a module V over a commutative ring R annihilated by a prime p. In this case, R′ is the second Witt vectors ring W2(R) considered as a square-zero extension of R by the Frobenius twist R(1).
Added: Nov 20, 2015
Working paper
Kudryashov Y. arxiv.org. math. Cornell University, 2012
In this article, we extend the phenomena of a bony attractor from a rather artificial class of step skew products to the class of diffeomorphisms on the Cartesian product of the two-dimensional torus by a sphere of arbitrary dimension.
Added: May 16, 2013
Working paper
Lazareva O. Economics. EC. Высшая школа экономики, 2012. No. 21.

This paper estimates the effect of economic shocks that affect families with young children on children’s health, educational and behavioral outcomes in adolescence.  Transition period in Russia provides a natural experiment setting for estimating this effect.  During the economic turmoil of early transition many people lost their jobs, experienced salary declines or occupational downgrading. These individual labor market shocks were mainly caused by the structural changes in the economy. Analyzing household survey data from Russia I find that children who were under the age of five and whose parents were negatively affected during the early transition have poorer health in adolescence and are less likely to have completed high school. For the comparison group  –  children who were at the school age during the early transition  –  there is an effect on educational outcomes and risky behaviors but not on health. Absence of a father in a family during the early transition years has a negative health effect only for the younger age group. I also find differential effects for boys and girls, by mother and father.

Added: Jan 17, 2013
Working paper
Goncharuk N. B., Kudryashov Y. arxiv.org. math. Cornell University, 2015. No. 1504.03313.
In this article we prove in a new way that a generic polynomial vector field in ℂ² possesses countably many homologically independent limit cycles. The new proof needs no estimates on integrals, provides thinner exceptional set for quadratic vector fields, and provides limit cycles that stay in a bounded domain.
Added: Apr 15, 2015
Working paper
Andreev N. A. Financial Economics. FE. Высшая школа экономики, 2017. No. WP BRP 59/FE/2017.
We study the boundedness properties of the value function for a general worst-case scenario stochastic dynamic programming problem. For the portfolio selection problem,we present sufficient economically reasonable conditions for the finitness and uniform boundedness of the value function. The results can be used to decide if the problem is ill-posed and to correctly solve the Bellman-Isaacs equation with an appropriate numeric scheme.
Added: Jan 25, 2017
Working paper
Kurnosov N. arxiv.org. math. Cornell University, 2015
We prove that b2 is bounded for hyperk¨ahler manifolds with vanishing odd-Betti numbers. The explicit upper boundary is conjectured. Following the method described by Sawon we prove that b2 is bounded in dimension eight and ten in the case of vanishing odd-Betti numbers by 24 and 25 respectively.
Added: Nov 15, 2015
Working paper
Przyjalkowski V. V., Shramov K. math. arxive. Cornell University, 2016
We prove that if a smooth variety with non-positive canonical class can be embedded into a weighted projective space of dimension~n as a well formed complete intersection and it is not an intersection with a linear cone therein, then the weights of the weighted projective space do not exceed n+1. Based on this bound we classify all smooth Fano complete intersections of dimensions 4 and 5, and compute their invariants.
Added: Apr 10, 2017
Working paper
Penskoi A., Nadirashvili N. S., Berdnikov A. S. math. arxive. Cornell University, 2016
The known upper bounds for the multiplicities of the Laplace-Beltrami operator eigenvalues on the real projective plane are improved for the eigenvalues with even indexes. Upper bounds for Dirichlet, Neumann and Steklov eigenvalues on the real projective plane with holes are also provided.
Added: Mar 21, 2017
Working paper
Feigin B. L., Miwa T., Jimbo M. et al. Cornell University Library, 2013. No. 1309.2147.
We construct an analog of the subalgebra $U\mathfrak{gl}(n)\otimes U\mathfrak{gl}(m)\subset U\mathfrak{gl}(m+n)$ in the setting of quantum toroidal algebras and study the restrictions of various representations to this subalgebra.
Added: Apr 24, 2014
Working paper
Parshakov P., Байдина К. О. Economics/EC. WP BRP. Высшая школа экономики, 2017. No. WP BRP 163/EC/2017.
This study estimates an attendance demand model in a reduced form, with uncertainty as one of the determinants of demand, to test the Uncertainty of Outcome Hypothesis (UOH), using data from the Russian Football Premier League (RFPL). These data fit our requirements for two reasons. First, there are few sellout matches, so demand for tickets in the RFPL is not restricted by stadium capacity. Secondly, there have hitherto been no articles devoted to the study of outcome uncertainty in the RFPL. The results indicate that the UOH does not explain the behavioural pattern of attendees in the RFPL. The dependence between the attendance and uncertainty is found to be U-shaped or even declining. We explain the U-shaped dependence by the visiting team effect; an attendee’s utility in the RFPL depends more on seeing a top team coming to the city than on the uncertainty of the outcome of the match.
Added: Jun 15, 2017
Working paper
Gasparetto T. M., Fernandez-Jardon Fernandez C. M., Barajas A. Management. MAN. Высшая школа экономики, 2014. No. Management WP BRP 30/MAN/2014.
The paper contributes to explain an unexplored competition that is the Brazilian State Championships. How it is organized and the financial features of three championships are described. The aim of the paper is to discover if the presence of "Brand-teams" in a competition increases the income of all participating teams and if the type of championship conditions the effect of Brand Team on revenues of all teams. As the present study aims to be a pioneer in economic research on Brazilian State Championships, it has an exploratory character. The study uses an equations system to estimate for testing the hypothesis. The estimation method is 3SLS to delete the possible endogeneity of the variables. There have been studied 400 matches played by 48 teams from Mineiro, Paulista and Carioca Championships in season 2013. The structure of the Brazilian State Championship, with the participation of brand-teams, creates an income redistribution effect. The features of the visiting team imply an increase in attendance. This effect is moderated by the type of Championship. The Championship structure generates an additional increase of the revenue. They increase according to the phase in which the competition develops. This paper contributes to introduce the Brazilian State Championships. Moreover, it comes to justify the participation of brand-teams in order to help smallest teams to increase their revenues. The paper shows that the organization of some Championships has more beneficial effects than others
Added: Dec 24, 2014
Working paper
Guriev S., Vakulenko E. Centre for Economic Policy Research Discussion Paper Series. ISSN 0265-8003. Centre for Economic Policy Research, 2013. No. 9675.
In this paper, we study panel data on region-to-region gross migration flows in Russia for 1995-2010. We find that barriers to labor mobility that hindered internal migration in 1990s, have been generally eliminated by the end of 2000s. In 1990s many poor Russian regions were in a poverty trap: potential workers wanted to leave those regions but could not afford to finance the move. In 2000s (especially in late 2000s), these barriers were no longer binding. Overall economic growth and development of financial markets allowed even poorest Russian regions to grow out of the poverty traps. This resulted in convergence in Russian labor market in 2000s; the interregional gaps in incomes, wages and unemployment rates decreased substantially and are now comparable to those in Europe.
Added: Feb 15, 2013