On which basis the price beside your powered up post rise on Steemit?

On which basis the price beside your post rise even if you are not getting any votes at the time...? I'm new here and I've noticed that happens with a powered up post.
Also, can the powered up post "affect" the other or previous posts on that basis even if they aren't powered up and how?

PS I'm not receiving any notifications when someone replies to my post currently. Do you have the same problem?!

Thank you!!! :)

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