Worldwide, the inverse correlation between the strength of the shadow economy and the minimum wage is pretty strong.  As the proportion of the shadow economy decreases, the minimum wage tends to go up.

In Oceania, the inverse correlation between the strength of the shadow economy and the minimum wage is extremely strong.  However, the sample size if four countries so it needs more data.

In Africa, the inverse correlation between the strength of the shadow economy and the minimum wage is very weak.  There is no real relationship between the strength of the shadow economy and minimum wage.

In Asia, the inverse correlation between the strength of the shadow economy and the minimum wage is very weak.  There is no real relationship between the strength of the shadow economy and minimum wage.

In Europe, the inverse correlation between the strength of the shadow economy and the minimum wage is very strong.  As the shadow economy weakens, the minimum wage tends to be higher.

In South America, the inverse correlation between the strength of the shadow economy and the minimum wage is pretty weak.  There is no real relationship between the strength of the shadow economy and minimum wage.

In North America, the inverse correlation between the strength of the shadow economy and the minimum wage is somewhat strong.  As the proportion of the shadow economy decreases, the minimum wage tends to go up.

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.