Z:gnu-www-ja-copyright-versus-community--3beb83-It's theoretically conceivable/en

It's theoretically conceivable that 20 years more copyright on future works would convince people to make more effort in producing those works. But not anyone rational, because the discounted present value of 20 more years of copyright starting 75 years in the future&mdash;if it's a work made for hire&mdash;and probably even longer if it's a work with an individual copyright holder, is so small it couldn't persuade any rational person to do anything different. Any business that wants to claim otherwise ought to present its projected balance sheets for 75 years in the future, which of course they can't do because none of them really looks that far ahead.