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@JamesGleick I think you've really struck on an interesting question.

Did the 1998 copyright extension act, for example, result in less creative work in total being made?

For example, were there measurably fewer books, films, paintings, photographs, record albums or other creative works? Maybe controlling for population.

I think confounding factors like the growth of the Internet, social media, streaming audio make it impossible to tease out what the effects of copyright extension were.