Jesus Christ, being rich, became poor, so that we, being poor, may become rich.
I have given this Answer, to the question (related to the present one), When was Jesus rich? 2 Corinthian 8:9, and I have been asked to "post an answer to this question".
As two Answers have already been given, and the Question has an Addendum, I will try to answer ...
First some semantics:
πτωχεύω (ptocheuo) is the verb, to be or become poor as a beggar, be (extremely) poor (BDAG), 2 Cor 8:9
πτωχεία (ptocheia), is cognate noun, state of being deficient in some means of support, poverty, 2 Cor 8:2, 9, Rev 2:9
πτωχός (ptochos), is the cognate adjective, for which BDAG provides four basic meanings:
Wealth is defined in God’s economy by its externality.
Anything that has an expiration date, is not considered a true wealth in the real sense of the word, also referred to as unrighteous wealth.
“But the day of the Lord will come like a thief, and then the heavens will pass away with a roar, and the heavenly bodies will be burned up and dissolved, and the ...