URL des Documents de travail : http://ces.univ-paris1.fr/cesdp/cesdp2013.htmlDocuments de travail du Centre d'Economie de la Sorbonne 2013.53 - ISSN : 1955-611XWe use the demand system approach to estimate the size of informal economy in Turkey following the methodology based on the analysis of the individual consumption behaviour proposed by Pissarides, Weber (1989), Lyssiotou et al. (2004), and Fortin et al. (2009). We extend this method by taking into account both the monetary expenditures and time spent on domestic activities. The necessary information of money and time inputs in consumption on the household's level is obtained by statistical match of Turkish Family Budget and Time Use surveys (2006). As expected, the estimated model si...