What was the reason behind the trade deflict

The fundamental cause of a trade deficit is an imbalance between a country's savings and investment rates. As Harvard's Martin Feldstein explains, the reason for the deficit can be boiled down to the United States as a whole spending more money than it makes, which results in a current account deficit

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.

idk