B. J. Blundell-r and . Lewbel-a, Quadratic Engel Curves and Consumer Demand, Review of Economic Studies, vol.89, issue.4, pp.527-539, 1997.

. Berger-k, Gospodarstwo domowe w gospodarce rynkowej -wyniki badania Ankietowego, dans : Szara Gospodarka w Polsce, 1996.

B. S. Stampini-m, Labour Mobility during Transition: Evidence from Georgia, Discussion Paper, vol.206, 2008.

C. W. Quandt-r, Models and estimation for centrally planned markets in disequilibrium, Review of Economic Studies, vol.49, pp.109-116, 1982.

D. M. Gardes-f and . Starzec-c, Garp violation, Economic Environment Distortions and Shadow Prices: Evidence from Household Expenditure Panel Data, forthcoming in Les Annales d'Economie et de Statistique, 2008.

D. M. Hénin-p, A Dynamic Macro Model of the Informal Economy, 2001.

F. , B. , and G. Lacroix-g, The Marginal Cost of Public Funds in the Presence of an Irregular Sector : An Empirical Investigation, The Journal of Public Economics, vol.55, pp.407-431, 1994.

F. , B. G. Lacroix, and C. Montmarquette, Are Underground Workers More Likely to be Underground Consumers ?, The Economic Journal, vol.110, issue.466, pp.838-860, 2000.

G. F. , G. G. Duncan, . Gaubert-p, and S. C. Gurgand-m, Panel and Pseudo-Panel Estimation of Cross-Sectional and Time Series Elasticities of Food Consumption, the Case of US and Polish Data, Journal of Business and Economic Statistics, vol.23, issue.2, pp.242-253, 2005.

G. F. Gaubert-p and . Langlois-s, A New Measure of Poverty in Canada, Canadian Journal of Sociology and Anthropology, pp.1-31, 1969.

K. M. Witkowski, Praca nierejestrowana w Polsce w 1995 rokuwyniki badania ankietowego, Szara Gospodarka w Polsce, 1996.

T. Hague:-kluwer-law, L. International, and G. Fortin-b, Utility-Based Estimation of Labor Supply Function 23, 1992.

L. , T. Fortin-b, and . Fréchette-p, The Effect of Taxes on Labor Supply in the Underground Economy, American Economic Review, vol.841, pp.231-254, 1994.

R. Z. Zienkowski-l, Szara gospodarka w systemie rachunkow narodowych, Szara Gospodarka w Polsce, 1996.

. ?i?j-?ij-ln-pit, ln pjt and b(pt) = ?i pit ?i Logarithm of total Expenditures instrumented. Other determinants : logarithmic age of the head, proportion of children in the family, relative logarithmic prices, education and location dummies, quarter dummies for each year. The true price index is approximated by a Stone price index