The size of the commission directly depends on the supply and demand in the market at the time of the transaction. On average, this parameter is 0.16-0.17 ADA. Also, the amount of the fee may vary with changes in electricity costs, equipment capacity and competition within the network.
Cardano is designed so that the system of transaction fees covers the costs of processing and long-term storage. The uniqueness of the network lies in the fact that the fees received are not sent directly to the block producer. First, the funds are collected in a single pool, after which they are distributed among the staking participants.