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Since electronic doesn't take up shelf space, it makes sense to limit the selection. With pbooks the library cannot buy more than there is shelves - to make room they need to get rid of older books. 15% saving is a bit low unless both methods stay viable. E.g. leave it perpetual, but allow extra temporary copies to be bought at a discount (e.g. 40% off for each additional 2 year copy). Allow perpetual copies to be returned for a refund (e.g. get 25% back when returning for a different perpetual book).
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