Worldwide, the correlation between economic strength and the minimum wage is pretty strong.  Most countries have low minimum wages and a small per capita GDP PPP.

In Oceania, the correlation between economic strength and the minimum wage is extremely strong. As far as these metrics go, there's New Zealand and Australia, and then there's everyone else.

In Africa, the correlation between economic strength and the minimum wage is pretty weak.  The majority of nations on the continent have a per capita GDP PPP below 10,000 international dollars and a minimum wage below 4,000 international dollars.

In Asia, the correlation between economic strength and the minimum wage is somewhat strong.  The majority of nations on the continent have a per capita GDP PPP below 30,000 international dollars and a minimum wage below 10,000 international dollars.  The only countries that surpass both of these numbers are Kuwait, Oman, Japan, South Korea, Israel, and Turkey.

In Europe, the correlation between economic strength and the minimum wage is pretty strong.  Just like with the shadow economy data, minimum wage tends to be similar to geographically proximate countries.

In South America, the correlation between economic strength and minimum wage is very weak.  Every country studied on the continent - excluding Guyana - has an annual minimum wage of at least 5,000 international dollars.

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.