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by diego 4211 days ago
It's not that transactions "incur" a fee. You pay the fee you want, and miners prioritize transactions accordingly. Because transactions take up space in the block chain (and everyone's hard drives), small transactions are given less priority. Large transactions usually don't need to pay fees to be mined, small transactions may take a long time to be mined (or in the case of "dust" not be mined at all) unless you pay the recommended fee.

https://en.bitcoin.it/wiki/Transaction_fees