Whelan, Ciara

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Whelan, Ciara
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Whelan, Ciara

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  • Publication
    Product differentiation and firm size distribution : an application to carbonated soft drinks
    (University College Dublin. School of Economics, 2001-06)
    Walsh, Patrick P. 
    ;
    Whelan, Ciara 
    Using brand level retail data, the firm size distribution in Carbonated Soft Drinks is shown to be an outcome of the degree to which firms have placed brands effectively (store coverage) across vertical (flavour, packaging, diet attributes) segments of the market. Regularity in the firm size distribution is not disturbed by the nature of short-run brand competition (turbulence in brand market shares) within segments. Remarkably, product differentiation resulting from firms acquiring various portfolios of product attributes and stores in market evolution determines the limiting firm size distribution.
      293
  • Publication
    Product differentiation and firm size distribution : an application to carbonated soft drinks
    (Suntory and Toyota International Centres for Economics and Related Disciplines, London School of Economics and Political Science, 2002-08)
    Whelan, Ciara 
    ;
    Walsh, Patrick P. 
    Using brand level retail data, the firm size distribution in Carbonated Soft Drinks is shown to be an outcome of the degree to which firms have placed brands effectively (store coverage) across vertical (flavour, packaging, diet attributes) segments of the market. Regularity in the firm size distribution is not disturbed by the nature of short-run brand competition (turbulence in brand market shares) within segments. Remarkably, product differentiation resulting from firms acquiring various portfolios of product attributes and stores in market evolution determines the limiting firm size distribution.
      605
  • Publication
    Coverage of retail stores and discrete choice models of demand : estimating price elasticities and welfare effects
    (University College Dublin. Geary Institute, 2010-01)
    Mariuzzo, Franco 
    ;
    Walsh, Patrick P. 
    ;
    Whelan, Ciara 
    Consumers' choice set of products within stores can be limited. Ackerberg and Rysman (2005) address this problem by modeling unobserved consumer preferences over products and retail stores, leading to augmented demand specifications. Having Carbonated Soft Drink product level data, where we observe products' store coverage, we are able to estimate their logit, nested logit and random coefficient logit specifications of demand in a structural model of equilibrium. Allowing for store coverage turns out to have a very significant impact on the estimated structural parameters and on the predictive power of the model. Taking these estimated structural parameters we perform a counterfactual whereby stores carry all products in the market. We find systematic increases in price elasticities and welfare in our new equilibrium. Competition in markets is more curtailed than normally assumed in structural models of industries.
      663