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Steem Power is just steem locked onto your account. You can only convert it back into steem slowly over the course of several weeks. So its a commitment to the platform, and thus the one that affects your upvoting power.

Ahhhhhhhhhhhhhhhhhhhhhh! Okay, that was the missing piece! Thank you so much, that actually really helps it all click into place now. I actually really like that concept, it stops people just trading Steem in and out of the platform on price action movements.

No problem!