In North America, the correlation between economic strength and minimum wage is strong.  Only two countries on the continent have an annual minimum wage of over 15,000 international dollars, Canada and the United States.  All other countries' annual minimum wage is below 9,000 international dollars.

The correlation between economic strength and the strength of the shadow economy is moderate.  Europe and Asia have the countries with the highest per capita GDP PPP while all continents except for Oceania have nations whose shadow economies make up more than half of their overall economies.

In Oceania, the correlation between economic strength and the strength of the shadow economy is pretty strong.  Every country studied on the continent - excluding Papua New Guinea - has a shadow economy that takes up at most one-third of its overall economy.

In Africa, the correlation between economic strength and the strength of the shadow economy is pretty strong.  Crime certainly doesn't pay, it seems.

In Asia, the correlation between economic strength and the strength of the shadow economy is pretty weak.  Every country studied on the continent - excluding Thailand and Georgia - has a shadow economy that takes up at most one-half of its overall economy.

In Europe, the correlation between economic strength and the strength of the shadow economy is pretty strong.  Every country studied on the continent - excluding Albania, Bulgaria, and Ukraine - has a shadow economy that takes up at most one-third of its overall economy.

In South America, the correlation between economic strength and the strength of the shadow economy is pretty weak.  Every country studied on the continent, excluding Chile, has a shadow economy that takes up at least one-fifth of its overall economy.

In North America, the indirect correlation between economic strength and the strength of the shadow economy is very strong.  The United States and Canada have by far the largest economies and the smallest proportion of underground activity.