That is actually not a rule. The reason why we still work so many hours it is not because everyone just inheretely wants to make a difference through hard work. The socioeconomic environment of our system forces, for multiple reasons, to work long hours, regardless what difference someone can make and regardless if that's the job that truly fits the maximum contribution the individual can give under other conditions or occupation.We've been told that year after year for decades. We're also only going to have to work 3 days a week some time after the 1950's because technology will do all the work for us. In reality, no matter how far tech will take us, we'll want to reach further and make up the difference through hard work - it's human nature (and even if not individually, one will be swept along by society).
A little study on anthropology will show different aspects of what is "human nature" that does not agree with the explanation "it is because we want to reach further" that the larger population still work many hours in the "developed" world. In some countries people work so hard to the point of mental and/or biological over exhaustion with little or zero satisfaction or real incentive. Often it destroys the balance of what the individual considers normal.
Free time on the other hand, in well structured societies actually offers the chance for a person to explore, discover and choose a path that the individual feels can contribute or develop his/herself farther in whatever direction (work or not) and in such occasions motivation is the real driving force of "hard work" and "long hours spent" which cannot be described necessarily as "work" anymore.
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