Inventory of black economy and orientation on developments of formal and informal economy in the last few years. Health insurance / number of employers in the last 10 years / history of social benefits / associations with 'work on the side' / frequency of work on the side in the Netherlands, comparison with 5 years ago / characteristics of people who are working on the side / acceptability of level of earnings on work on the side in combination with other sources of income / acceptability of other 'irregularities', petty crime / activities to save money on consumption articles in household of respondent: second hand goods, do-it-yourself, exchange, auction, fancy-fair, following courses for do-it-yourselfer/ comparison with a few years ago / respondent has obtained clothings in the last 4 weeks, in which way / obtained furniture / odd jobs about the house or house rebuild in this year, who was involved to do these jobs / reparation of electric domestic appliances, by whom / respondent does odd jobs for others with or without payment, characteristics of those jobs and their compensation / respondent does work on the side, why ( not ) / profits of education, ( former ) occupation and use of materials and tools of others for own work on the side / regularity and number of hours spend on own work on the side / compensation and earnings of work on the side, how did respondent find such a job. Background variables: basic characteristics/ residence/ household characteristics/ occupation/employment/ income/capital assets/ education