While I wouldn't want to attribute either cause as being more or less, it is a n interesting confounding variable that I wonder who the original and subsequent

While I wouldn't want to attribute either cause as being more or less, it is a n interesting confounding variable that I wonder who the original and subsequent research accounted for it. Especially since it also applies elsewhere in life. For example, investing money is delaying gratification, but it is also a question if you think you will actually make money which is not guaranteed.