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It means you can "lend" someone else SP.

I could delegate 1000 SP to you and then you could use it to vote and earn curation rewards.

Currently the lender see's no benefits in the existing implementation.

or rent out SP, sounds good to me

So there would be the option to "lend out" for a specified period as well as the ability to actually give away?

what's in it for the lendee?

what if we changed it to this proposal?
https://steemit.com/witness-category/@fyrstikken/voting-power-to-the-people-and-curation-rewards-to-the-investors-please-bookmark-and-read-later-if-you-are-busy (Man I wish we had 255 comment depth now) The "experiment" has shown that this work

Yes.

If you can give it away permanently or just lend it out I would think the lendee would need to attain some form of monetary profit.

The lender see's no benefit.

The lendee can then use that SP to vote and earn curation rewards.

Ok, maybe i've confused who is the lender vs lendee. If I lend to someone, I get no benefit. So why do it?

@fyrstikken I'm not sure I followed it all, but sounds good ;-)