That seems to be persuading even Harry Potter to look more closely at digital distribution.

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Lest you doubt that Harry Potter is evidence of a new conservatism in Hollywood merchandising, consider this: a mere 75 or so product licences have been issued for Harry Potter merchandise in America, and even fewer elsewhere.

ECONOMIST: Harry Potter and the publishing goldmine

Even though the star is now earning huge bucks for the last few Harry Potter films, the movies do so well that it balances out.

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The Harry Potter books are rife with teen angst, themes of disenchantment, the struggle for identity, even aggression and castration fantasies, as Dr. Rosegrant wrote in the Journal of the American Psychoanalytic Association last year.

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He proved his post-Harry Potter mettle in the hit horror The Woman in Black, but now Daniel Radcliffe has moved even further away from the role that made him famous - playing poet Allen Ginsberg in the low-budget, independent thriller, Kill Your Darlings.

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Since Universal opened its Harry Potter exhibit earlier this year in Orlando, attendance has picked up at the Disney parks as well even as discounting has been pulled back.

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It imposed tough conditions on Coca-Cola, insisting that no Harry Potter images should appear on cans, and is now in the process of making its licensing programme even more restrictive.

ECONOMIST: Harry Potter and the publishing goldmine