http://0-www.sciencedirect.com.bianca.penlib.du.edu/science/article/pii/S019566630900676X
-This source discusses the correlation between the shopping habits of low-income consumers specifically the quality of the food bought.

http://0-go.galegroup.com.bianca.penlib.du.edu/ps/i.do?action=interpret&id=GALE%7CA307920527&v=2.1&u=udenver&it=r&p=AONE&sw=w&authCount=1
-This source has a bit more substance to it an goes into the research behind the shopping habits of mothers and women. For instance who shops at the same store every day as opposed to those who shop in different stores looking for better prices and many more similar concepts