Sa iyong palagay, bakit maaaring sumama sa Mabuting Mundo ang mga nasa unang pangkat? Bakit hindi pa maaaring sumama ang nasa ikalawa?

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.