Paul speaks of "joy" and "poverty" as if they were living things that can produce generosity. Alternate translation: "because of the people's great joy and extreme poverty, they have become very generous" (See: [[rc://en/ta/man/translate/figs-personification]])
Paul speaks of joy as if it were a physical object that could increase in size or quantity. (See: [[rc://en/ta/man/translate/figs-metaphor]])
# extremity of their poverty ... riches of generosity
Though the churches of Macedonia have suffered testings of affliction and poverty, by God's grace, they have been able to collect money for the believers in Jerusalem.
# great riches of generosity
"a very great generosity." The words "great riches" emphasize the greatness of their generosity.