What is the fee of ERC20?
Could you please elaborate on the cost structure associated with ERC20 tokens? I'm particularly interested in understanding the various fees that might be involved in transactions, whether it's the gas fee paid to miners for processing transactions on the Ethereum blockchain or any other potential costs. Additionally, I'd like to know if these fees are fixed or variable, and if there are any factors that can affect their amount. It would be helpful if you could provide a comprehensive overview of the ERC20 fee landscape, as it would greatly assist me in understanding the economics of this popular token standard.