For all of you, here is what happened:
You own a lawn mowing business. 4 of your cub cadets were stolen by a gang. Later, one of your employees has talked to you and for $500 in wages, the Cub Cadet that he uses to mow lawn will be his and he'll use it still to do the lawn mowing. On one of the mowings, the gang kidnaps your employee and the cub cadet. The gang says, unless you trade 10 push mowers, for your employee and 4 cub cadets, you won't see your employee ever again. So as the boss, you agree. You arrive at the gang hangout and free your employee and the cub he uses and 3 other cubs. The gang leader says, 1 of the original cubs they stole is still theirs since they only bargained to turn over 4 cubs.
Later at the end of the summer, when your employee is ready to leave for college, he comes to get his pay and the cub cadet that he uses. You as the owner, says, "you can have your pay but not the cub cadet. Since I (the owner) had to pay 10 push mowers for you and 4 cub cadets, I bought the cub cadet (from the gang) that you were using that was stolen by the gang. In fact, you lost your cub cadet to the gang."