How Does the Block Subsidy Affect a Miner’s Revenue Compared to Transaction Fees?

The block subsidy is the fixed amount of new cryptocurrency a miner receives for successfully mining a block, which is the primary source of revenue in early blockchain stages. Transaction fees are variable and supplemental.

As the network matures and the subsidy undergoes "halving" events, the proportion of revenue from fees increases relative to the subsidy. Eventually, fees are expected to become the main revenue source, securing the network long-term.