Is the Experimental Auction a Dynamic Market?
Author
Abstract
Suggested Citation
DOI: 10.1007/s10640-004-6981-z
Download full text from publisher
As the access to this document is restricted, you may want to search for a different version of it.
References listed on IDEAS
- Dermot J. Hayes & Jason F. Shogren & Seung Youll Shin & James B. Kliebenstein, 1995.
"Valuing Food Safety in Experimental Auction Markets,"
American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 77(1), pages 40-53.
- Hayes, Dermot J. & Shogren, Jason F. & Shin, Seung Youll & Kliebenstein, James, 1995. "Valuing Food Safety in Experimental Auction Markets," Staff General Research Papers Archive 835, Iowa State University, Department of Economics.
- Davis, Douglas D & Williams, Arlington W, 1991. "The Hayek Hypothesis in Experimental Auctions: Institutional Effects and Market Power," Economic Inquiry, Western Economic Association International, vol. 29(2), pages 261-274, April.
- Jason F. Shogren & John A. List & Dermot J. Hayes, 2000.
"Preference Learning in Consecutive Experimental Auctions,"
American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 82(4), pages 1016-1021.
- Shogren, Jason F. & List, John & Hayes, Dermot J., 2000. "Preference Learning in Consecutive Experimental Auctions," Staff General Research Papers Archive 5023, Iowa State University, Department of Economics.
- Dermot Hayes & John List & Jason Shogren, 2000. "Preference Learning in Consecutive Experimental Auctions," Artefactual Field Experiments 00519, The Field Experiments Website.
- Fox, John A & Hayes, Dermot J & Shogren, Jason F, 2002.
"Consumer Preferences for Food Irradiation: How Favorable and Unfavorable Descriptions Affect Preferences for Irradiated Pork in Experimental Auctions,"
Journal of Risk and Uncertainty, Springer, vol. 24(1), pages 75-95, January.
- Fox, John A. & Hayes, Dermot J. & Shogren, Jason F., 2002. "Consumer Preferences for Food Irradiation: How Favorable and Unfavorable Descriptions Affect Preferences for Irradiated Pork in Experimental Auctions," Staff General Research Papers Archive 5207, Iowa State University, Department of Economics.
- Todd Cherry & Peter Frykblom & Jason Shogren & John List & Melonie Sullivan, 2004.
"Laboratory Testbeds and Non-Market Valuation: The Case of Bidding Behavior in a Second-Price Auction with an Outside Option,"
Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 29(3), pages 285-294, November.
- Todd L. Cherry & Peter Frykblom & John List & Jason Shogren & Melonie Williams, 2002. "Laboratory Testbeds and Nonmarket Valuation: The Case of Bidding Behavior in a Second Price Auction with an Outside Option," Working Papers 02-13, Department of Economics, Appalachian State University.
- Ty Feldkamp & Ted C. Schroeder, 2004.
"Experimental Auction Procedure: Impact on Valuation of Quality Differentiated Goods,"
American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 86(2), pages 389-405.
- Ty Feldkamp & Jayson Lusk & Ted Schroeder, 2004. "Experimental auction procedure: Impact on valuation of quality differentiated goods," Artefactual Field Experiments 00097, The Field Experiments Website.
- Jayson L. Lusk, 2003. "An Experimental Test of the Commitment Cost Theory," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 85(5), pages 1316-1322.
- Kahneman, Daniel & Knetsch, Jack L & Thaler, Richard H, 1990. "Experimental Tests of the Endowment Effect and the Coase Theorem," Journal of Political Economy, University of Chicago Press, vol. 98(6), pages 1325-1348, December.
- William Vickrey, 1961. "Counterspeculation, Auctions, And Competitive Sealed Tenders," Journal of Finance, American Finance Association, vol. 16(1), pages 8-37, March.
- Elizabeth Hoffman & Dale J. Menkhaus & Dipankar Chakravarti & Ray A. Field & Glen D. Whipple, 1993. "Using Laboratory Experimental Auctions in Marketing Research: A Case Study of New Packaging for Fresh Beef," Marketing Science, INFORMS, vol. 12(3), pages 318-338.
- Jayson L. Lusk & John A. Fox & Ted C. Schroeder & James Mintert & Mohammad Koohmaraie, 2001.
"In-Store Valuation of Steak Tenderness,"
American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 83(3), pages 539-550.
- John Fox & Mohammad Koohmaraie & Jayson Lusk & James Mintert & Ted Schroeder, 2001. "In-store valuation of steak tenderness," Framed Field Experiments 00186, The Field Experiments Website.
- Don L. Coursey & John L. Hovis & William D. Schulze, 1987. "The Disparity Between Willingness to Accept and Willingness to Pay Measures of Value," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 102(3), pages 679-690.
- Shogren, Jason F. & Seung Y. Shin & Dermot J. Hayes & James B. Kliebenstein, 1994.
"Resolving Differences in Willingness to Pay and Willingness to Accept,"
American Economic Review, American Economic Association, vol. 84(1), pages 255-270, March.
- Shogren, Jason F. & Shin, Seung Youll & Hayes, Dermot J. & Kliebenstein, James, 1994. "Resolving Differences in Willingness to Pay and Willingness to Accept," Staff General Research Papers Archive 701, Iowa State University, Department of Economics.
- Shogren, Jason F. & Shin, Seung Y. & Hayes, Dermot J. & Kliebenstein, James B., 1994. "Resolving Differences in Willingness to Pay and Willingness to Accept," ISU General Staff Papers 199403010800001005, Iowa State University, Department of Economics.
- Kolstad, Charles D. & Guzman, Rolando M., 1999. "Information and the Divergence between Willingness to Accept and Willingness to Pay," Journal of Environmental Economics and Management, Elsevier, vol. 38(1), pages 66-80, July.
- Harrison, Glenn W, 1992. "Theory and Misbehavior of First-Price Auctions: Reply," American Economic Review, American Economic Association, vol. 82(5), pages 1426-1443, December.
- Hayes, Dermot J. & Kliebenstein, James & Shogren, Jason F. & Fox, John A., 1995. "Economics of Food Safety," Staff General Research Papers Archive 10453, Iowa State University, Department of Economics.
- Noussair, Charles & Robin, Stephane & Ruffieux, Bernard, 2002.
"Do consumers not care about biotech foods or do they just not read the labels?,"
Economics Letters, Elsevier, vol. 75(1), pages 47-53, March.
- Noussair, C. & Robin, S. & Ruffieux, B., 2001. "Do Consumers Not Care about Biotech Foods or Do They Just Not Read the Labels?," Purdue University Economics Working Papers 1142, Purdue University, Department of Economics.
- Jay R. Corrigan & Matthew C. Rousu, 2006. "The Effect of Initial Endowments in Experimental Auctions," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 88(2), pages 448-457.
- Charles Noussair & StÈphane Robin & Bernard Ruffieux, 2004. "Do Consumers Really Refuse To Buy Genetically Modified Food?," Economic Journal, Royal Economic Society, vol. 114(492), pages 102-120, January.
Citations
Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
Cited by:
- Rousu, Matthew C. & Marette, Stéphan & Thrasher, James F. & Lusk, Jayson L., 2014.
"The economic value to smokers of graphic warning labels on cigarettes: Evidence from combining market and experimental auction data,"
Journal of Economic Behavior & Organization, Elsevier, vol. 108(C), pages 123-134.
- Matthew C. Rousu & Stephan Marette & James F. Thrasher & Jayson L. Lusk, 2014. "The economic value to smokers of graphic warning labels on cigarettes: evidence from combining Mmarket and experimental auction data," Post-Print hal-01173058, HAL.
- Jay Corrigan & Catherine Kling & Jinhua Zhao, 2008.
"Willingness to Pay and the Cost of Commitment: An Empirical Specification and Test,"
Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 40(2), pages 285-298, June.
- Corrigan, Jay R. & Kling, Catherine L. & Zhao, Jinhua, 2008. "Willingness to Pay and the Cost of Commitment: An Empirical Specification and Test," ISU General Staff Papers 200806010700001347, Iowa State University, Department of Economics.
- Claudia Bazzani & Vincenzina Caputo & Rodolfo M. Nayga JR. & Maurizio Canavari, 2017. "Testing Commitment Cost Theory In Choice Experiments," Economic Inquiry, Western Economic Association International, vol. 55(1), pages 383-396, January.
- Corrigan, Jay R. & Rousu, Matthew C., 2008.
"Testing Whether Field Auction Experiments Are Demand Revealing in Practice,"
Journal of Agricultural and Resource Economics, Western Agricultural Economics Association, vol. 33(2).
- Jay Corrigan & Matthew Rousu, 2008. "Testing whether field auction experiments are demand revealing in practice," Framed Field Experiments 00161, The Field Experiments Website.
- Waldman, Kurt B. & Kerr, John M., 2015. "Is Food and Drug Administration policy governing artisan cheese consistent with consumers’ preferences?," Food Policy, Elsevier, vol. 55(C), pages 71-80.
- repec:ken:wpaper:0603 is not listed on IDEAS
- Lee, Ji Yong & Fox, John A., 2016. "The effects of allowing substitutes on bidding behavior in a private value experimental auction," 2016 Annual Meeting, July 31-August 2, Boston, Massachusetts 235900, Agricultural and Applied Economics Association.
- repec:ken:wpaper:0601 is not listed on IDEAS
- Ortega, David L. & Wolf, Christopher A., 2018. "Demand for farm animal welfare and producer implications: Results from a field experiment in Michigan," Food Policy, Elsevier, vol. 74(C), pages 74-81.
- Corrigan, Jay R., 2006. "The Reverse Auction: A New Approach to Experimental Auction Valuation," 2006 Annual meeting, July 23-26, Long Beach, CA 21449, American Agricultural Economics Association (New Name 2008: Agricultural and Applied Economics Association).
- repec:ken:wpaper:0804 is not listed on IDEAS
- Lusk, Jayson L. & Norwood, F. Bailey, 2009. "Bridging the gap between laboratory experiments and naturally occurring markets: An inferred valuation method," Journal of Environmental Economics and Management, Elsevier, vol. 58(2), pages 236-250, September.
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.- repec:ken:wpaper:0501 is not listed on IDEAS
- repec:ken:wpaper:0601 is not listed on IDEAS
- Shogren, Jason F., 2006. "Experimental Methods and Valuation," Handbook of Environmental Economics, in: K. G. Mäler & J. R. Vincent (ed.), Handbook of Environmental Economics, edition 1, volume 2, chapter 19, pages 969-1027, Elsevier.
- repec:ken:wpaper:0602 is not listed on IDEAS
- Lusk Jayson L & Alexander Corinne & Rousu Matthew C., 2007.
"Designing Experimental Auctions for Marketing Research: The Effect of Values, Distributions, and Mechanisms on Incentives for Truthful Bidding,"
Review of Marketing Science, De Gruyter, vol. 5(1), pages 1-32, October.
- Lusk Jayson L & Alexander Corinne & Rousu Matthew C., 2007. "Designing Experimental Auctions for Marketing Research: The Effect of Values, Distributions, and Mechanisms on Incentives for Truthful Bidding," Review of Marketing Science, De Gruyter, vol. 5(1), pages 1-32, October.
- Lusk, Jayson L. & Alexander, Corinne E. & Rousu, Matthew C., 2004. "Designing Experimental Auctions For Marketing Research: Effect Of Values, Distributions, And Mechanisms On Incentives For Truthful Bidding," 2004 Annual meeting, August 1-4, Denver, CO 20202, American Agricultural Economics Association (New Name 2008: Agricultural and Applied Economics Association).
- Alfnes, Frode & Rickertsen, Kyrre & Ueland, Oydis, 2005.
"Experimental Evidence of Risk Aversion in Consumer Markets: The Case of Beef Tenderness,"
2005 Annual meeting, July 24-27, Providence, RI
19285, American Agricultural Economics Association (New Name 2008: Agricultural and Applied Economics Association).
- Alfnes, Frode & Rickertsen, Kyrre & Ueland, Oydis, 2005. "Experimental Evidence of Risk Aversion in Consumer Markets: The Case of Beef Tenderness," 2005 International Congress, August 23-27, 2005, Copenhagen, Denmark 24553, European Association of Agricultural Economists.
- Rousu, Matthew C. & Monchuk, Daniel C. & Shogren, Jason F. & Kosa, Katherine M., 2005.
"Consumer Willingness to Pay for "Second-Generation" Genetically Engineered Products and the Role of Marketing Information,"
Journal of Agricultural and Applied Economics, Southern Agricultural Economics Association, vol. 37(3), pages 1-11, December.
- Rousu, Matthew C. & Monchuk, Daniel C. & Shogren, Jason F. & Kosa, Katherine M., 2005. "Consumer Willingness to Pay for “Second-Generation” Genetically Engineered Products and the Role of Marketing Information," Journal of Agricultural and Applied Economics, Cambridge University Press, vol. 37(3), pages 647-657, December.
- Frode Alfnes, 2007.
"Willingness to Pay versus Expected Consumption Value in Vickrey Auctions for New Experience Goods,"
American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 89(4), pages 921-931.
- Alfnes, Frode, 2006. "Willingness To Pay Versus Expected Consumption Value In Vickrey Auctions For New Experience Goods," 2006 Annual meeting, July 23-26, Long Beach, CA 21211, American Agricultural Economics Association (New Name 2008: Agricultural and Applied Economics Association).
- Matthew C. Rousu & Robert H. Beach & Jay R. Corrigan, 2008. "The Effects of Selling Complements and Substitutes on Consumer Willingness to Pay: Evidence from a Laboratory Experiment," Canadian Journal of Agricultural Economics/Revue canadienne d'agroeconomie, Canadian Agricultural Economics Society/Societe canadienne d'agroeconomie, vol. 56(2), pages 179-194, June.
- Shogren, Jason F. & Margolis, Michael & Koo, Cannon & List, John A., 2001.
"A random nth-price auction,"
Journal of Economic Behavior & Organization, Elsevier, vol. 46(4), pages 409-421, December.
- Cannon Koo & John List & Michael Margolis & Jason Shogren, 2001. "A random nth-price auction," Artefactual Field Experiments 00517, The Field Experiments Website.
- Clark, Jeremy & Friesen, Lana, 2008.
"The causes of order effects in contingent valuation surveys: An experimental investigation,"
Journal of Environmental Economics and Management, Elsevier, vol. 56(2), pages 195-206, September.
- Jeremy Clark & Lana Friesen, 2006. "The Causes of Order Effects in Contingent Valuation Surveys: An Experimental Investigation," Working Papers in Economics 06/06, University of Canterbury, Department of Economics and Finance.
- Huffman, Wallace E. & Shogren, Jason F. & Rousu, Matthew C. & Tegene, Abebayehu, 2003.
"Consumer Willingness to Pay for Genetically Modified Food Labels in a Market with Diverse Information: Evidence from Experimental Auctions,"
Journal of Agricultural and Resource Economics, Western Agricultural Economics Association, vol. 28(3), pages 1-22, December.
- Huffman, Wallace E. & Shogren, Jason F. & Rousu, Matthew & Tegene, Abebayehu, 2003. "Consumer Willingness to Pay for Genetically Modified Food Labels in a Market with Diverse Information: Evidence from Experimental Auctions," ISU General Staff Papers 200312010800001376, Iowa State University, Department of Economics.
- Huffman, Wallace & Shogren, J. E. & Rousu, M. & Tegene, Abebayehu, 2003. "Consumer Willingness to Pay for Genetically Modified Food Labels in a Market with Diverse Information: Evidence from Experimental Auctions," Staff General Research Papers Archive 12256, Iowa State University, Department of Economics.
- Bruner, David M. & Huth, William L. & McEvoy, David M. & Morgan, O. Ashton, 2014.
"Consumer Valuation of Food Safety: The Case of Postharvest Processed Oysters,"
Agricultural and Resource Economics Review, Cambridge University Press, vol. 43(2), pages 300-318, August.
- Bruner, David M. & Huth, William L. & McEvoy, David M. & Morgan, O. Ashton, 2014. "Consumer Valuation of Food Safety: The Case of Postharvest Processed Oysters," Agricultural and Resource Economics Review, Northeastern Agricultural and Resource Economics Association, vol. 43(2), pages 1-19, August.
- Laurent Muller & Bernard Ruffieux, 2011.
"Do price-tags influence consumers’ willingness to pay? On the external validity of using auctions for measuring value,"
Experimental Economics, Springer;Economic Science Association, vol. 14(2), pages 181-202, May.
- Muller, L. & Ruffieux, B., 2010. "Do price-tags influence consumers' willingness to pay ? On external validity of using auctions for measuring value," Working Papers 201003, Grenoble Applied Economics Laboratory (GAEL).
- Frode Alfnes & Kyrre Rickertsen & Øydis Ueland, 2008. "Consumer attitudes toward low stake risk in food markets," Applied Economics, Taylor & Francis Journals, vol. 40(23), pages 3039-3049.
- Waldman, Kurt B. & Kerr, John M., 2015. "Is Food and Drug Administration policy governing artisan cheese consistent with consumers’ preferences?," Food Policy, Elsevier, vol. 55(C), pages 71-80.
- Anne Rozan & Anne Stenger & Marc Willinger, 2004.
"Willingness-to-pay for food safety: An experimental investigation of quality certification on bidding behaviour,"
Framed Field Experiments
00197, The Field Experiments Website.
- Anne Rozan & Anne Stenger-Letheux & Marc Willinger, 2004. "Willingness-to-pay for food safety : an experimental investigation of quality certification on bidding behavior," Post-Print hal-01072925, HAL.
- Anne Rozan & Anne Stenger & Marc Willinger, 2004. "Willingness-to-Pay for Food Safety : An Experimental Investigation of Quality Certification on Bidding Behaviour," Post-Print hal-00278981, HAL.
- Tegene, Abebayehu & Huffman, Wallace E. & Rousu, Matthew C. & Shogren, Jason F., 2003.
"The Effects Of Information On Consumer Demand For Biotech Foods: Evidence From Experimental Auctions,"
Technical Bulletins
33577, United States Department of Agriculture, Economic Research Service.
- Tegene, Abebayehu & Huffman, Wallace E. & Rousu, Matthew & Shogren, Jason F., 2003. "The Effects of Information on Consumer Demand for Biotech Foods: Evidence from Experimental Auctions," Technical Bulletins 184323, United States Department of Agriculture, Economic Research Service.
- Colson, Gregory & Huffman, Wallace E. & Rousu, Matthew C., 2011.
"Improving the Nutrient Content of Food through Genetic Modification: Evidence from Experimental Auctions on Consumer Acceptance,"
Journal of Agricultural and Resource Economics, Western Agricultural Economics Association, vol. 36(2), pages 1-22, August.
- Colson, Gregory & Rousu, Matthew C. & Huffman, Wallace E., 2008. "Consumers' Willingness to Pay for New Genetically Modified Food Products: Evidence from Experimental Auctions of Intragenic and Transgenic Foods," 2008 Annual Meeting, July 27-29, 2008, Orlando, Florida 6407, American Agricultural Economics Association (New Name 2008: Agricultural and Applied Economics Association).
- Colson, Gregory & Huffman, Wallace E., 2009. "Consumers’ Willingness to Pay for New Genetically Modified Food Products: Evidence from Experimental Auctions of Intragenic and Transgenic Foods," 2009 Conference, August 16-22, 2009, Beijing, China 49986, International Association of Agricultural Economists.
- Lee, Ji Yong & Fox, John A., 2016. "The effects of allowing substitutes on bidding behavior in a private value experimental auction," 2016 Annual Meeting, July 31-August 2, Boston, Massachusetts 235900, Agricultural and Applied Economics Association.
- Irz, Xavier & Mazzocchi, Mario & Réquillart, Vincent & Soler, Louis-Georges, 2015.
"Research in Food Economics: past trends and new challenges,"
Revue d'Etudes en Agriculture et Environnement, Editions NecPlus, vol. 96(01), pages 187-237, March.
- Xavier IRZ & Mario MAZZOCCHI & Vincent RÉQUILLART & Louis-Georges SOLER, 2015. "Research in Food Economics: past trends and new challenges," Review of Agricultural and Environmental Studies - Revue d'Etudes en Agriculture et Environnement, INRA Department of Economics, vol. 96(1), pages 187-237.
- IRZ, Xavier & MAZZOCCHI, Mario & REQUILLART, Vincent & SOLER, Louis-Georges, 2015. "Research in Food Economics: past trends and new challenges," Review of Agricultural and Environmental Studies - Revue d'Etudes en Agriculture et Environnement (RAEStud), Institut National de la Recherche Agronomique (INRA), vol. 96(1), March.
- Xavier Irz & Mario Mazzocchi & Vincent Requillart & Louis-Georges Soler, 2015. "Research in Food Economics: past trends and new challenges," Post-Print hal-01884941, HAL.
- Huffman, Wallace & Rousu, M. & Shogren, Jason F. & Tegene, Abebayehu, 1009.
"Are U.S. Consumers Tolerant of GM Foods?,"
Staff General Research Papers Archive
12336, Iowa State University, Department of Economics.
- Rousu, Matthew C. & Huffman, Wallace E. & Shogren, Jason F. & Tegene, Abebayehu, 2002. "Are Us Consumers Tolerant Of Gm Foods?," 2002 Annual meeting, July 28-31, Long Beach, CA 19889, American Agricultural Economics Association (New Name 2008: Agricultural and Applied Economics Association).
- Rousu, Matthew & Huffman, Wallace E. & Shogren, Jason F. & Tegene, Abebayehu, 2002. "Are U.S. Consumers Tolerant of GM Foods?," ISU General Staff Papers 200210150700001233, Iowa State University, Department of Economics.
- Rousu, Matthew & Huffman, Wallace & Shogren, Jason F. & Tegene, Abebayehu, 2002. "Are U.S. Consumers Tolerant of GM Foods?," Staff General Research Papers Archive 10050, Iowa State University, Department of Economics.
- Rousu, Matthew C. & Huffman, Wallace E. & Shogren, Jason F. & Tegene, Abebayehu, 2002. "Are U.S. Consumers Tolerant Of Gm Foods?," Working Papers 18227, Iowa State University, Department of Economics.
- Dragicevic, Arnaud Z. & Ettinger, David, 2011.
"Private Valuation of a Public Good in Three Auction Mechanisms,"
Journal of Benefit-Cost Analysis, Cambridge University Press, vol. 2(2), pages 1-29, April.
- Dragicevic Arnaud Z. & Ettinger David, 2011. "Private Valuation of a Public Good in Three Auction Mechanisms," Journal of Benefit-Cost Analysis, De Gruyter, vol. 2(2), pages 1-29, April.
- Arnaud Dragicevic & David Ettinger, 2010. "Private Valuation of a Public Good in Three Auction Mechanisms," CIRANO Working Papers 2010s-04, CIRANO.
- Arnaud Dragicevic & David Ettinger, 2011. "Private Valuation of a Public Good in Three Auction Mechanisms," Post-Print hal-00704708, HAL.
More about this item
Keywords
commitment cost; dynamic markets; experimental auctions; real option theory;All these keywords.
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:kap:enreec:v:31:y:2005:i:1:p:35-45. 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: Sonal Shukla or Springer Nature Abstracting and Indexing (email available below). General contact details of provider: http://www.springer.com .
Please note that corrections may take a couple of weeks to filter through the various RePEc services.