Stationarity, structural breaks, and economic growth in Mexico: 1895-2008
Author
Abstract
Suggested Citation
Download full text from publisher
References listed on IDEAS
- Vougas, Dimitrios V., 2007. "Is the trend in post-WW II US real GDP uncertain or non-linear?," Economics Letters, Elsevier, vol. 94(3), pages 348-355, March.
- Ben-David, Dan & Papell, David H, 2000.
"Some Evidence on the Continuity of the Growth Process among the G-7 Countries,"
Economic Inquiry, Western Economic Association International, vol. 38(2), pages 320-330, April.
- Ben-David, D. & Pappel, D.H., 1996. "Some Evidence on the Continuity of the Growth Process Among the G7 Countries," Papers 5-96, Tel Aviv.
- Ben-David, D., 1998. "Some Evidence on the Continuity of the Growth Process Among the G7 Countries," Papers 98-01, Houston - Department of Economics.
- Noriega, Antonio E. & de Alba, Enrique, 2001. "Stationarity and structural breaks -- evidence from classical and Bayesian approaches," Economic Modelling, Elsevier, vol. 18(4), pages 503-524, December.
- Kapetanios, George & Shin, Yongcheol & Snell, Andy, 2003. "Testing for a unit root in the nonlinear STAR framework," Journal of Econometrics, Elsevier, vol. 112(2), pages 359-379, February.
- Tsangyao Chang & Ching-Chun Wei & Chien-Chung Nieh, 2005. "Is Per Capita Real GDP Stationary? Evidence from Selected African Countries Based on More Powerful Nonlinear (Logistic) Unit Root Tests," Economics Bulletin, AccessEcon, vol. 3(24), pages 1-9.
- Mohitosh Kejriwal & Pierre Perron, 2010.
"A sequential procedure to determine the number of breaks in trend with an integrated or stationary noise component,"
Journal of Time Series Analysis, Wiley Blackwell, vol. 31(5), pages 305-328, September.
- Mohitosh Kejriwal & Pierre Perron, 2009. "A Sequential Procedure to Determine the Number of Breaks in Trend with an Integrated or Stationary Noise Component," Boston University - Department of Economics - Working Papers Series wp2009-005, Boston University - Department of Economics.
- Mohitosh Kejriwal & Pierre Perron, 2009. "A Sequential Procedure to Determine the Number of Breaks in Trend with an Integrated or Stationary Noise Component," Purdue University Economics Working Papers 1217, Purdue University, Department of Economics.
- Duck, N W, 1992. "UK Evidence on Breaking Trend Functions," Oxford Economic Papers, Oxford University Press, vol. 44(3), pages 426-439, July.
- David Harvey & Terence Mills, 2002. "Unit roots and double smooth transitions," Journal of Applied Statistics, Taylor & Francis Journals, vol. 29(5), pages 675-683.
- George Kapetanios, 2005.
"Unit‐root testing against the alternative hypothesis of up to m structural breaks,"
Journal of Time Series Analysis, Wiley Blackwell, vol. 26(1), pages 123-133, January.
- George Kapetanios, 2002. "Unit Root Testing against the Alternative Hypothesis of up to m Structural Breaks," Working Papers 469, Queen Mary University of London, School of Economics and Finance.
- David I. Harvey & Terence C. Mills, 2004. "Tests for Stationarity in Series with Endogenously Determined Structural Change," Oxford Bulletin of Economics and Statistics, Department of Economics, University of Oxford, vol. 66(5), pages 863-894, December.
- Mark Aguiar & Gita Gopinath, 2007.
"Emerging Market Business Cycles: The Cycle Is the Trend,"
Journal of Political Economy, University of Chicago Press, vol. 115(1), pages 69-102.
- Mark Aguiar & Gita Gopinath, 2004. "Emerging market business cycles: the cycle is the trend," Working Papers 04-4, Federal Reserve Bank of Boston.
- Mark Aguiar & Gita Gopinath, 2004. "Emerging Market Business Cycles: The Cycle is the Trend," NBER Working Papers 10734, National Bureau of Economic Research, Inc.
- Aguiar, Mark & Gopinath, Gita, 2007. "Emerging Market Business Cycles: The Cycle is the Trend," Scholarly Articles 11988098, Harvard University Department of Economics.
- Jushan Bai & Pierre Perron, 1998.
"Estimating and Testing Linear Models with Multiple Structural Changes,"
Econometrica, Econometric Society, vol. 66(1), pages 47-78, January.
- Perron, P. & Bai, J., 1995. "Estimating and Testing Linear Models with Multiple Structural Changes," Cahiers de recherche 9552, Universite de Montreal, Departement de sciences economiques.
- Perron, P. & Bai, J., 1995. "Estimating and Testing Linear Models with Multiple Structural Changes," Cahiers de recherche 9552, Centre interuniversitaire de recherche en économie quantitative, CIREQ.
- Rudebusch, Glenn D, 1992.
"Trends and Random Walks in Macroeconomic Time Series: A Re-examination,"
International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 33(3), pages 661-680, August.
- Glenn D. Rudebusch, 1990. "Trends and random walks in macroeconomic time series: a re-examination," Working Paper Series / Economic Activity Section 105, Board of Governors of the Federal Reserve System (U.S.).
- Glenn D. Rudebusch, 1990. "Trends and random walks in macroeconomic time series: a re-examination," Finance and Economics Discussion Series 139, Board of Governors of the Federal Reserve System (U.S.).
- Leybourne, Stephen J. & Mizen, Paul, 1999. "Understanding the disinflations in Australia, Canada and New Zealand using evidence from smooth transition analysis," Journal of International Money and Finance, Elsevier, vol. 18(5), pages 799-816, October.
- Papell, David H & Prodan, Ruxandra, 2004. "The Uncertain Unit Root in U.S. Real GDP: Evidence with Restricted and Unrestricted Structural Change," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 36(3), pages 423-427, June.
- Foster, Neil & Stehrer, Robert, 2007. "Modeling transformation in CEECs using smooth transitions," Journal of Comparative Economics, Elsevier, vol. 35(1), pages 57-86, March.
- Diebold, Francis X & Senhadji, Abdelhak S, 1996. "The Uncertain Unit Root in Real GNP: Comment," American Economic Review, American Economic Association, vol. 86(5), pages 1291-1298, December.
- George Kapetanios, 2005.
"Unit‐root testing against the alternative hypothesis of up to m structural breaks,"
Journal of Time Series Analysis, Wiley Blackwell, vol. 26(1), pages 123-133, January.
- George Kapetanios, 2002. "Unit Root Testing against the Alternative Hypothesis of up to m Structural Breaks," Working Papers 469, Queen Mary University of London, School of Economics and Finance.
- George Kapetanios, 2002. "Unit Root Testing against the Alternative Hypothesis of up to m Structural Breaks," Working Papers 469, Queen Mary University of London, School of Economics and Finance.
- George Kapetanios & Yongcheol Shin, 2006.
"Unit root tests in three-regime SETAR models,"
Econometrics Journal, Royal Economic Society, vol. 9(2), pages 252-278, July.
- George Kapetanios & Yongcheol Shin, 2002. "Unit Root Tests in Three-Regime SETAR Models," Working Papers 465, Queen Mary University of London, School of Economics and Finance.
- George Kapetanios & Yongcheol Shin, 2003. "Unit Root Tests in Three-Regime SETAR Models," Edinburgh School of Economics Discussion Paper Series 104, Edinburgh School of Economics, University of Edinburgh.
- Dickey, David A & Pantula, Sastry G, 1987. "Determining the Ordering of Differencing in Autoregressive Processes," Journal of Business & Economic Statistics, American Statistical Association, vol. 5(4), pages 455-461, October.
- Pablo Astorga & Ame R. Bergés & Valpy Fitzgerald, 2005. "Endogenous Growth and Exogenous Shocks in Latin America During the Twentieth Century," Oxford Economic and Social History Working Papers _057, University of Oxford, Department of Economics.
- Dan Ben-David & David H. Papell, 1998.
"Slowdowns And Meltdowns: Postwar Growth Evidence From 74 Countries,"
The Review of Economics and Statistics, MIT Press, vol. 80(4), pages 561-571, November.
- Ben-David, Dan & Papell, David, 1995. "Slowdowns and Meltdowns: Post-war Growth Evidence from 74 Countries," CEPR Discussion Papers 1111, C.E.P.R. Discussion Papers.
- Dan Ben-David & David H. Papell, 1997. "Slowdowns and Meltdowns: Postwar Growth Evidence from 74 Countries," NBER Working Papers 6266, National Bureau of Economic Research, Inc.
- Ben-David, D. & Papell, D.H., 1996. "Slowdowns and Meltdowns: Post-War Growth Evidence from 74 Countries," Papers 9-96, Tel Aviv.
- Jushan Bai & Pierre Perron, 2003.
"Computation and analysis of multiple structural change models,"
Journal of Applied Econometrics, John Wiley & Sons, Ltd., vol. 18(1), pages 1-22.
- BAI, Jushan & PERRON, Pierre, 1998. "Computation and Analysis of Multiple Structural-Change Models," Cahiers de recherche 9807, Universite de Montreal, Departement de sciences economiques.
- Tom Doan, "undated". "MULTIPLEBREAKS: RATS procedure to perform multiple structural change analysis," Statistical Software Components RTS00138, Boston College Department of Economics.
- Tom Doan, "undated". "RATS programs to replicate examples of Bai-Perron procedure," Statistical Software Components RTZ00008, Boston College Department of Economics.
- Tom Doan, "undated". "BAIPERRON: RATS procedure to perform Bai-Perron Test for Multiple Structural Changes," Statistical Software Components RTS00013, Boston College Department of Economics.
- Noriega, Antonio E. & Soria, Luis M. & Velázquez, Ramón, 2008.
"International evidence on stochastic and deterministic monetary neutrality,"
Economic Modelling, Elsevier, vol. 25(6), pages 1261-1275, November.
- Noriega Antonio E. & Soria Luis M. & Velázquez Ramón, 2008. "International Evidence on Stochastic and Deterministic Monetary Neutrality," Working Papers 2008-04, Banco de México.
- Mehmet Caner & Bruce E. Hansen, 2001.
"Threshold Autoregression with a Unit Root,"
Econometrica, Econometric Society, vol. 69(6), pages 1555-1596, November.
- Bruce E. Hansen & Mehmet Caner, 1997. "Threshold Autoregressions with a Unit Root," Boston College Working Papers in Economics 381, Boston College Department of Economics.
- Mishra, Tapas, 2009. "Comment on "The uncertain unit root in real GNP: A re-examination"," Journal of Macroeconomics, Elsevier, vol. 31(1), pages 167-172, March.
- Ame Bergés & Valpy Fitzgerald, 2005. "Endogenous Growth and Exogenous Shocks in Latin America During the Twentieth Century," Economics Series Working Papers 2005-W57, University of Oxford, Department of Economics.
- Perron, Pierre & Qu, Zhongjun, 2007.
"A simple modification to improve the finite sample properties of Ng and Perron's unit root tests,"
Economics Letters, Elsevier, vol. 94(1), pages 12-19, January.
- Pierre Perron & Zhongjun Qu, 2006. "A Simple Modification to Improve the Finite Sample Properties of Ng and Perron’s Unit Root Tests," Boston University - Department of Economics - Working Papers Series WP2006-010, Boston University - Department of Economics.
- George Kapetanios & Yongcheol Shin, 2006.
"Unit root tests in three-regime SETAR models,"
Econometrics Journal, Royal Economic Society, vol. 9(2), pages 252-278, July.
- George Kapetanios & Yongcheol Shin, 2002. "Unit Root Tests in Three-Regime SETAR Models," Working Papers 465, Queen Mary University of London, School of Economics and Finance.
- George Kapetanios & Yongcheol Shin, 2002. "Unit Root Tests in Three-Regime SETAR Models," Working Papers 465, Queen Mary University of London, School of Economics and Finance.
- George Kapetanios & Yongcheol Shin, 2003. "Unit Root Tests in Three-Regime SETAR Models," Edinburgh School of Economics Discussion Paper Series 104, Edinburgh School of Economics, University of Edinburgh.
- Mills, Terence C, 1991. "Are Fluctuations in U.K. Ouput Transitory or Permanent?," The Manchester School of Economic & Social Studies, University of Manchester, vol. 59(1), pages 1-11, March.
- Noriega, Antonio E., 2004. "Long-run monetary neutrality and the unit-root hypothesis: further international evidence," The North American Journal of Economics and Finance, Elsevier, vol. 15(2), pages 179-197, August.
- Rudebusch, Glenn D, 1993.
"The Uncertain Unit Root in Real GNP,"
American Economic Review, American Economic Association, vol. 83(1), pages 264-272, March.
- Glenn D. Rudebusch, 1992. "The uncertain unit root in real GNP," Finance and Economics Discussion Series 193, Board of Governors of the Federal Reserve System (U.S.).
- Robert Sollis, 2004. "Asymmetric adjustment and smooth transitions: a combination of some unit root tests," Journal of Time Series Analysis, Wiley Blackwell, vol. 25(3), pages 409-417, May.
- Pantula, Sastry G., 1989. "Testing for Unit Roots in Time Series Data," Econometric Theory, Cambridge University Press, vol. 5(2), pages 256-271, August.
- Serena Ng & Pierre Perron, 2001.
"LAG Length Selection and the Construction of Unit Root Tests with Good Size and Power,"
Econometrica, Econometric Society, vol. 69(6), pages 1519-1554, November.
- Serena Ng & Pierre Perron, 1997. "Lag Length Selection and the Construction of Unit Root Tests with Good Size and Power," Boston College Working Papers in Economics 369, Boston College Department of Economics, revised 01 Sep 2000.
- Robert Sollis & Stephen Leybourne & Paul Newbold, 1999. "Unit Roots and Asymmetric Smooth Transitions," Journal of Time Series Analysis, Wiley Blackwell, vol. 20(6), pages 671-677, November.
- Darné, Olivier, 2009. "The uncertain unit root in real GNP: A re-examination," Journal of Macroeconomics, Elsevier, vol. 31(1), pages 153-166, March.
- Dan Ben-David & Robin L. Lumsdaine & David H. Papell, 2003.
"Unit roots, postwar slowdowns and long-run growth: Evidence from two structural breaks,"
Empirical Economics, Springer, vol. 28(2), pages 303-319, April.
- Ben-David, D. & Lumsdaine, L.R. & Papell, D.H., 1996. "Unit Roots Postwar Slowdowns and Long-Run Growth: Evidence from Two Structural Breaks," Papers 33-96, Tel Aviv.
- Dan Ben-David & Robin L. Lumsdaine & David H. Papell, 1998. "Unit Roots, Postwar Slowdowns and Long-Run Growth: Evidence from Two Structural Breaks," NBER Working Papers 6397, National Bureau of Economic Research, Inc.
- repec:bla:manchs:v:68:y:2000:i:2:p:145-65 is not listed on IDEAS
- Lin, Chien-Fu Jeff & Terasvirta, Timo, 1994. "Testing the constancy of regression parameters against continuous structural change," Journal of Econometrics, Elsevier, vol. 62(2), pages 211-228, June.
- Vougas, Dimitrios V., 2006. "On unit root testing with smooth transitions," Computational Statistics & Data Analysis, Elsevier, vol. 51(2), pages 797-800, November.
- Stephen Leybourne & Paul Newbold & Dimitrios Vougas, 1998. "Unit roots and smooth transitions," Journal of Time Series Analysis, Wiley Blackwell, vol. 19(1), pages 83-97, January.
- repec:ebl:ecbull:v:3:y:2005:i:24:p:1-9 is not listed on IDEAS
- Antonio E. Noriega & Araceli Ramírez-Zamora, 1999. "Unit roots and multiple structural breaks in real output," Estudios Económicos, El Colegio de México, Centro de Estudios Económicos, vol. 14(2), pages 163-188.
Most related items
These are the items that most often cite the same works as this one and are cited by the same works as this one.- Noriega, Antonio E. & Soria, Luis M. & Velázquez, Ramón, 2008.
"International evidence on stochastic and deterministic monetary neutrality,"
Economic Modelling, Elsevier, vol. 25(6), pages 1261-1275, November.
- Noriega Antonio E. & Soria Luis M. & Velázquez Ramón, 2008. "International Evidence on Stochastic and Deterministic Monetary Neutrality," Working Papers 2008-04, Banco de México.
- Paraskevi Salamaliki & Ioannis Venetis, 2014. "Smooth transition trends and labor force participation rates in the United States," Empirical Economics, Springer, vol. 46(2), pages 629-652, March.
- R. Velazquez & A.E. Noriega & L.M. Soria, 2004.
"International Evidence on Monetary Neutrality Under Broken Trend Stationary Models,"
Econometric Society 2004 Latin American Meetings
57, Econometric Society.
- R. Velazquez & Noriega & A., 2004. "International evidence on monetary neutrality under broken trend stationary models," Computing in Economics and Finance 2004 282, Society for Computational Economics.
- Noriega Antonio E. & Ventosa-Santaulària Daniel, 2010. "Spurious Long-Horizon Regression in Econometrics," Working Papers 2010-06, Banco de México.
- Niels Haldrup & Robinson Kruse & Timo Teräsvirta & Rasmus T. Varneskov, 2013.
"Unit roots, non-linearities and structural breaks,"
Chapters, in: Nigar Hashimzade & Michael A. Thornton (ed.), Handbook of Research Methods and Applications in Empirical Macroeconomics, chapter 4, pages 61-94,
Edward Elgar Publishing.
- Niels Haldrup & Robinson Kruse & Timo Teräsvirta & Rasmus T. Varneskov, 2012. "Unit roots, nonlinearities and structural breaks," CREATES Research Papers 2012-14, Department of Economics and Business Economics, Aarhus University.
- Sandberg, Rickard, 2016. "Trends, unit roots, structural changes, and time-varying asymmetries in U.S. macroeconomic data: the Stock and Watson data re-examined," Economic Modelling, Elsevier, vol. 52(PB), pages 699-713.
- Ventosa-Santaulària, Daniel & Noriega, Antonio E., 2015. "Long-run monetary neutrality under stochastic and deterministic trends," Economic Modelling, Elsevier, vol. 47(C), pages 372-382.
- Chen, Shyh-Wei & Wu, An-Chi, 2018. "Is there a bubble component in government debt? New international evidence," International Review of Economics & Finance, Elsevier, vol. 58(C), pages 467-486.
- Giorgio Canarella & Rangan Gupta & Stephen M. Miller & Tolga Omay, 2019. "Does U.K.’s Real GDP have a Unit Root? Evidence from a Multi-Century Perspective," Working Papers 201926, University of Pretoria, Department of Economics.
- Mohitosh Kejriwal & Claude Lopez, 2013.
"Unit Roots, Level Shifts, and Trend Breaks in Per Capita Output: A Robust Evaluation,"
Econometric Reviews, Taylor & Francis Journals, vol. 32(8), pages 892-927, November.
- Mohitosh Kejriwal & Claude Lopez, 2009. "Unit Roots, Level Shifts and Trend Breaks in Per Capita Output: A Robust Evaluation," Purdue University Economics Working Papers 1227, Purdue University, Department of Economics.
- Kejriwal , M. & Lopez, C., 2011. "Unit Roots, Level Shifts and Trend Breaks in Per Capita Output: A Robust Evaluation," Working papers 334, Banque de France.
- Mohitosh Kejriwal & Claude Lopez, 2010. "Unit Roots, Level Shifts and Trend Breaks in PerCapita Output: A Robust Evaluation," University of Cincinnati, Economics Working Papers Series 2010-02, University of Cincinnati, Department of Economics.
- Kejriwal, Mohitosh & Lopez, Claude, 2010. "Unit Roots, Level Shifts and Trend Breaks in Per Capita Output: A Robust Evaluation," MPRA Paper 25204, University Library of Munich, Germany.
- Chen, Shyh-Wei, 2014. "Smooth transition, non-linearity and current account sustainability: Evidence from the European countries," Economic Modelling, Elsevier, vol. 38(C), pages 541-554.
- Omay, Tolga, 2012. "The comparison of optimization algorithms on unit root testing with smooth transition," MPRA Paper 42129, University Library of Munich, Germany.
- Tolga Omay & Furkan Emirmahmutoğlu, 2017. "The Comparison of Power and Optimization Algorithms on Unit Root Testing with Smooth Transition," Computational Economics, Springer;Society for Computational Economics, vol. 49(4), pages 623-651, April.
- Vasudeva N. R. Murthy & Natalya Ketenci, 2017. "Is technology still a major driver of health expenditure in the United States? Evidence from cointegration analysis with multiple structural breaks," International Journal of Health Economics and Management, Springer, vol. 17(1), pages 29-50, March.
- Phiri, Andrew, 2018.
"Robust analysis of convergence in per capita GDP in BRICS economies,"
MPRA Paper
86936, University Library of Munich, Germany.
- Andrew Phiri, 2018. "Robust analysis of convergence in per capita GDP in BRICS economies," Working Papers 1822, Department of Economics, Nelson Mandela University.
- Chen, Shyh-Wei & Xie, Zixiong, 2017. "Asymmetric adjustment and smooth breaks in dividend yields: Evidence from international stock markets," International Review of Economics & Finance, Elsevier, vol. 48(C), pages 339-354.
- Ketenci, Natalya, 2014. "The bilateral trade balance of the EU in the presence of structural breaks," MPRA Paper 54661, University Library of Munich, Germany.
- Olivier Darné & Amélie Charles, 2012.
"A note on the uncertain trend in US real GNP: Evidence from robust unit root tests,"
Economics Bulletin, AccessEcon, vol. 32(3), pages 2399-2406.
- Amélie Charles & Olivier Darné, 2010. "A note on the uncertain trend in US real GNP: Evidence from robust unit root test," Working Papers hal-00547737, HAL.
- Olivier Darné & Amélie Charles, 2012. "A note of the uncertain trend in US real GNP: Evidence from robust unit root tests," Post-Print hal-00956936, HAL.
- Omid Ranjbar & Xiao-Lin Li & Tsangyao Chang & Chien-Chiang Lee, 2015. "Stability of long-run growth in East Asian countries: New evidence from panel stationarity test with structural breaks," The Journal of International Trade & Economic Development, Taylor & Francis Journals, vol. 24(4), pages 570-589, June.
- Carlos Capistrán & Manuel Ramos‐Francia, 2009.
"Inflation Dynamics In Latin America,"
Contemporary Economic Policy, Western Economic Association International, vol. 27(3), pages 349-362, July.
- Ramos Francia Manuel & Capistrán Carlos, 2006. "Inflation Dynamics in Latin America," Working Papers 2006-11, Banco de México.
More about this item
JEL classification:
- C12 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General - - - Hypothesis Testing: General
- C13 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General - - - Estimation: General
- C15 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General - - - Statistical Simulation Methods: General
- C22 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Time-Series Models; Dynamic Quantile Regressions; Dynamic Treatment Effect Models; Diffusion Processes
- O47 - Economic Development, Innovation, Technological Change, and Growth - - Economic Growth and Aggregate Productivity - - - Empirical Studies of Economic Growth; Aggregate Productivity; Cross-Country Output Convergence
- O54 - Economic Development, Innovation, Technological Change, and Growth - - Economywide Country Studies - - - Latin America; Caribbean
NEP fields
This paper has been announced in the following NEP Reports:- NEP-CIS-2011-10-22 (Confederation of Independent States)
- NEP-FDG-2011-10-22 (Financial Development and Growth)
Statistics
Access and download statisticsCorrections
All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:bdm:wpaper:2011-11. See general information about how to correct material in RePEc.
If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.
If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .
If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.
For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Subgerencia de desarrollo de sistemas (email available below). General contact details of provider: https://edirc.repec.org/data/bangvmx.html .
Please note that corrections may take a couple of weeks to filter through the various RePEc services.