Sammendrag
Finland Sweden and Norway lose out on a lot of potential tax money due to the shadow economy in the construction industry. Workers employed within companies such as these work with bad working conditions and lose the right to pension and sick leave. This leads to negative consequences within the society and is not sustainable since a welfare state relies on taxes to function. To combat tax evasion and work-related crime in public procurements in Finland, Sweden and Norway laws, regulations and strategies have been put in place. The objective of this thesis is to compare what each country has done with the perspective of economic efficiency, effectiveness in combating the shadow economy and reducing work-related crime.