A man bought a horse named Harry for $60 and sold him for $70, then bought him back for $80 and sold him for $90. Solving this problem individually, people get different answers. However, if they solve it individually and then discuss it in a group, the group nearly always gets the correct answer of $20 profit. The same problem stated for an "animal business" with a horse and pig transactions is mathematically identical, but people are much more likely to get it right because discussing the similar horse problem first resolved the source of confusion. This demonstrates the value of parallel processing problems independently and then discussing solutions in a group.