Conditioned response: In psychology, the term conditioned response is a very important part of the classical conditioning theory or experiment. The theory was introduced by the psychologist Ivan Pavlov.
In classical conditioning, the term conditioned response is defined as a behavior that doesn't occur naturally and is being learned by organisms (animal or human beings) by associating a neutral stimulus with an unconditioned stimulus.
In the question above, the child's salivation to the sound of the can opener is a conditioned response.
It was positive because slaves could pick the cotton much faster that way, and it increased the availability of cotton for sale and for things like clothes because the cotton gin got it done so much faster