I’d like to see the methodology used and how charitable giving was measured, but on the face of it, this information seems to be commonsensical.
If you are low-income, chances are that the people that you know are also living through touch economic times. If a neighbor is in need of help, you do as much as you can. You can relate to where the person in need is coming from and you see that need on a daily basis.
When I worked with homeless individuals, I was often surprised by the small acts of philanthropy they practiced daily. They tended to be generous almost to a fault, as they regularly shared food and blankets with each other, along with other items that are less healthy, but provide comfort. They ‘took care of their own.’
It seems that kind of behavior is unexceptional among those in need.