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Dive into the research topics where H.M. Koolma is active.

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Featured researches published by H.M. Koolma.


Psychonomic Bulletin & Review | 2017

Scale, mergers and efficiency: the case of Dutch housing corporations

Jacob Veenstra; H.M. Koolma; Maarten Allers

The efficiency of social housing providers is a contentious issue. In the Netherlands, there is a widespread belief that housing corporations have substantial potential for efficiency improvements. A related question is whether scale influences efficiency, since recent decades have shown a trend of mergers among corporations. This paper offers a framework to assess the effects of scale and mergers on the efficiency of Dutch housing corporations by using both a data envelopment analysis and a stochastic frontier analysis, using panel data for 2001–2012. The results indicate that most housing corporations operate under diseconomies of scale, implying that merging would be undesirable in most cases. However, merging may have beneficial effects on pure technical efficiency as it forces organizations to reconsider existing practices. A data envelopment analysis indeed confirms this hypothesis, but these results cannot be replicated by a stochastic frontier analysis, meaning that the evidence for this effect is not robust.


Journal of Housing and The Built Environment | 2016

Relative efficiency, mergers and the scale paradox: the case of Dutch housing corporations

Jacob Veenstra; H.M. Koolma; M.A. dr. Allers

The efficiency of social housing providers is a contentious issue. In the Netherlands, there is a widespread belief that housing corporations have substantial potential for efficiency improvements. A related question is whether scale influences efficiency, since recent decades have shown a trend of mergers among corporations. This paper offers a framework to assess the effects of scale and mergers on the efficiency of Dutch housing corporations by using both a data envelopment analysis and a stochastic frontier analysis, using panel data for 2001–2012. The results indicate that most housing corporations operate under diseconomies of scale, implying that merging would be undesirable in most cases. However, merging may have beneficial effects on pure technical efficiency as it forces organizations to reconsider existing practices. A data envelopment analysis indeed confirms this hypothesis, but these results cannot be replicated by a stochastic frontier analysis, meaning that the evidence for this effect is not robust.


Archive | 2009

Verhalen en Prestaties : Een onderzoek naar het gedrag van woningcorporaties

H.M. Koolma


Efficiëntie en effectiviteit van de publieke sector in de weegschaal | 2010

Van verhalen naar prestaties. Effectiviteit en efficiëntie van woningcorporaties

H.M. Koolma; D. Verlet; C. Devos


Stedebouw en Volkshuisvesting | 2015

Ander leiderschap van corporaties

H.M. Koolma; J. van der Schaar; Vu


Politicologen etmaal | 2013

A matter of scale: The accomplishment of scale advantages by Dutch housing corporations

H.M. Koolma; J.R. Hulst; A.J.G.M. van Montfort; D. Verlet; F. Bongers


Liber Amicorum Jan van der Moolen | 2013

‘Kenniet bestaat niet!’ – enige bespiegelingen over de missie en mores van woningcorporaties

H.M. Koolma


Archive | 2018

Onderzoek naar risico’s op fraude en niet-integer handelen bij pakketverkopen door woningcorporaties aan commerciële partijen Opdrachtgever: Autoriteit Woningcorporaties

H.M. Koolma; John Poot; Jurgen van Vliet


Vlaams Tijdschrift voor Overheidsmanagement | 2017

Interne toezichtsraad als zelfsturend team: Verkenning van concepten voor zelforganisatie

H.M. Koolma


Archives of Business Research | 2017

Are larger organizations more efficient and strategically stronger? A crosssectional and longitudinal research into Dutch housing corporations

H.M. Koolma; J.R. Hulst; A.J.G.M. van Montfort

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Vu

VU University Medical Center

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F. Fleurke

VU University Amsterdam

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