> Benefits of this proposal outweigh the cons. Average length of patent protection will decrease.
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Why not do that in the straightforward way of simply decreasing the patent protection duration? Or as other people have suggestion: make it contingent on the type of thing being patented.
Because different patents might have vastly different value. If someone has invested a billion dollars to develop some new technology, they might want to benefit from it longer than someone who invested $10k. Yet, this scheme still allows the $10k investor to keep protecting his invention in case it's wildly successful.
