Thanks for the feedback @lightcoin 
You're right, there’s a typo in the last graphic, I’ll update it

I planned to cover fee rates in a separate post to keep this one concise but will add a quick clarification to avoid confusion

bitcoin_devs

Is there a typo in the last graphic in your post, which shows an arrow going from 

 in the block? And same for arrow going from 

Also, although you say you will discuss fee rates in the next article, I think it has to be discussed here, at least so long as you are making claims like "To maximize their revenue, miners prioritize transactions that pay higher fees", which is not true, miners prioritize fee rates, not total fees. This is further confused in the last graphic where it shows a 

 transactions. Strictly speaking the miner would be looking at the 

 and prioritizing accordingly (knapsack problem aside...)

bitcoin

Fee calculation in bitcoin

Is there a typo in the last graphic in your post, which shows an arrow going from `Tx 2` in the mempool to `Tx 3` in the block? And same for arrow going from `Tx 3` in mempool to `Tx 2` in block.

Also, although you say you will discuss fee rates in the next article, I think it has to be discussed here, at least so long as you are making claims like "To maximize their revenue, miners prioritize transactions that pay higher fees", which is not true, miners prioritize fee rates, not total fees. This is further confused in the last graphic where it shows a `7000 sats` fee tx getting prioritized over `5000 sats` and `4000 sats` transactions. Strictly speaking the miner would be looking at the _fee rate_ and prioritizing accordingly (knapsack problem aside...)