<prompt> Human:  <response>: Assistant professors of marketing David Gal and Blakeley B. McShane got to the heart of the question by obtaining access to a unique data set. Provided by a leading debt settlement company, it gave precise information as to how 6,000 people finally eliminated their credit-card debt. In their analysis, Gal and McShane found that consumers who pursued the small victories strategy were more likely to eliminate their entire debt balance. A unique sample set? How about a skewed sample set. 