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On Defining and Measuring the Informal Sector
In this paper, the authors investigate the degree of congruence between three definitions of informality based on employment contract registration, social security protection, and the characteristics of the employer and employment using Brazilian household survey data for the period 1992 to 2001.
Link
http://www-wds.worldbank.org/servlet/WDSContentServer/WDSP/IB/2006/03/03/000016406_20060303150551/Rendered/PDF/wps3866.pdf