Answer:
Greece
Step-by-step explanation:
The underground economy includes activities that are not taxed or regulated, generally known as black market activities. This classification includes a broad range of activities such as a babysitter not paying taxes, many self-employment activities, activities carried out by illegal aliens, illegal services like prostitution, selling of forged goods, to selling of illegal drugs or weapons.
What classifies an activity as part of the black market is that the person that carries them out doesn't pay taxes, or doesn't pay full taxes for them. The larger the black market, the more money a government loses in uncollected taxes. It is very difficult to measure the GDP properly if the relative weight of these activities in the economy is high, since a single person may perform illegal activities but uses the proceeds to purchase legal products.