The current yearly supply inflation rate for monero is 0.47%, this will always decrease as a percentage as the tail emissions are fixed. 

Compare that with inbound liquidity fees for lightning, and it's insignificant if you use is for regular transactions. 
 https://image.nostr.build/e6f6a357e9bd6bcdec94a64873140653db8e69d075f8f0f13c7661b6a596aec1.jpg

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