The poor are mention throughout the Word - with two different meanings. Ether one, we are to take care of the poor. Those that are economically challenged are peoples responsibility; not Santa's. Christ Jesus stated that "the poor we would always have among us" leads one to believe that there is a test ongoing - and the poor are not the ones being tested.
The poor are mention in Deut.20:25 concerning money, and usury. Ex.20:25 a poor man and his cause, and not showing partiality. Lev.19:15 righteous judgment. Deut.15:11 the poor among us, always. Prov.14:31 oppressing the poor; etc.
Pity upon the poor is a loan that the Lord promises to repay: that is the great investment. God mentions harvesting a field, and leaving the corners for the poor. The other poor is just as widespread-maybe even more so than the lack of economics: the spiritual bankrupt.
Immanuel's objective - Luke 4:18. Mission accomplished - Luke 7:22. Everything that Christ Jesus taught was Kingdom business[Matt.5:17] on earth. "Blessed are the poor in spirit" is here in time. This poor = lowly, afflicted, destitute; not in the afterlife.
Kingdom = a royal power: The territory subject to the rule of a king. Blessed are the poor in spirit, because they are primed and ready to enter the Kingdom of Heaven, on earth.