What aspects of demand can a business control? What can't it control? What can producers do with information about the demand curve, as well as information about trends affecting demand changes, to spur their growth?

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.

answer; illegible handwriting;