So, -paytxfee sets nTransactionFee.

Can someone explain how nTransactionFee causes a client to behave?

And more specifically, what happens when node A sets 1000.0 and all other nodes use 0.01?

No, that’s not what it is.

-paytxfee allows you to include a transaction fee with your transactions.  If transaction confirmations become slow, you can get priority by using “-paytxfee=0.01”.  Any transactions you send would cost an extra 0.01.  There’s no reason to use more than 0.01.

It’s just there in case we need it.  It probably won’t be needed, and it can be explained more if we do.

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