Regarding "On Paying Publishers Extra For Extra Usage Rights" (was "Fair use
is not enough" [1]) Professor Harnad wrote [2],
>It's important that everyone understand clearly what is at issue here:
...
>The question is whether they are worth the extra money at this time.
Just for my information - how much are we talking about
(extra-money-per-publication, just an order-of magnitude fourchette) ?