I want to know the answer to the following question:
What company purchased the  Cubs in 1981?
All the background I'm provided with is that "After a nearly two-year process which involved potential buyers such as Mark Cuban and a group led by Hank Aaron, a family trust of TD Ameritrade founder Joe Ricketts won the bidding process as the 2009 season came to a close.". Is that enough to answer the question?