If the demand for high-definition televisions increases, you can expect their price to (3 points) increase
not change
cut in half
decrease

Increase, if you have higher demand, the prices are going to increase

Explanation:

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.