system
Given the following post, respond as if you're commenting on Reddit:
human
What are some chief changes from John Rawls’ original (1971) to revised (1999) version of his book A Theory Of Justice?

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gpt
The tweaks are numerous but not too serious to significantly deviate from the original position. Two major changes were made. First, the concept of liberty was revised to properly explain why it is ought to take priority in front of other values, which in the revised edition takes into account the ability to have sense of justice and conception of the good. This was done to respond to criticism Hart outlined in his "Rawls on Liberty and Its Priority". Second, a revised concept of the idea of primary goods, or goods one wants regardless of anything else, is presented, in order to make it clear that it is ideal-oriented and is not based on some arbitrary desire people might have.