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Physical version of Mario Kart World will cost €90
(hexbear.net)
And on the American website, the MSRP is $80, with no distinction made between digital and physical yet.
I'm sure there are a lot of factors, but shifting away from cartridges was a big cost cut.
I looked up PS1 game prices and apparently they were about $50 which was about $100 in todays money. I remember $50 being the price of some of the bigger Wii games back when I started gaming and the $60 price point was the norm for a while. Kinda interesting how games seemed inflation proof.