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That's correct. So if rshares stay constant, the value of current posts isn't affected.

However, if more people start voting (or just 1 big whale), the number of rshares will increase and the value of non-paid posts will fall.

Agree with you. Maybe I was just not saying it clearly, but what I was trying to say you already said perfectly in your guide.

Let's pretend a piece of content is currently worth $5. But then, many other posts suddenly become highly-upvoted. The money to pay those popular posts needs to come from somewhere, so a portion of your post's value is reallocated to these newly-popular posts. Now your post may only be worth $4.50.

It can work the other way around too...

Let's say a post is currently worth $5. Over the next few days, new Steem is created, but only half as many people are voting compared to recent days. That means there's a lot of new Steem with nowhere to go, so it goes to the posts that already has votes - the ones with pending payouts. Now your $5 post may have increased to $6.

This isn't exactly how it works, but it's the simplest way I know how to explain it.