Brazilian system is the most simple: It is already the final price (not counting shipping, which might be many options), with EVERY tax included. Period. What i see is what i pay. Even Aliexpress shows numbers with all taxes included in the final total price now.
The Yankee system is honestly both insane and fraudulent, nothing is ever the price that the webpages or stickers show, i always have to guess it's somewhere between 10% and 20% more. The european system is also more honest, unless they also have other taxes besides VAT that they don't show.
They became split after 2019, with a roller-coaster track of (some) highs and (more) lows, specially if we are counting the marvel disney tv series too (since they are inter-connected now, we should). No genre or franchise ever died suddenly, even DC had successes years after BvS 'Martha is our mother's name' event (which also did make money itself, the loss of goodwill only shows up in later entries).
My analysis is that most of the successes are prologues of pre-2019 stories and characters, redoubling the appeal to nostalgia and giving an ending where Marvel lets (guardians 3, deadpool for fox marvel, spider man with the 3 spiders and ending current peter's arc). The actually new stories and characters, that should be the ones being widely seen cause they are supposed to star and steer the MCU now, have been duds (and lots of old timers are also having hard times, like Nick Fury). This is a strong indicator of decline, and the fact they threw money bags at Robert D. Junior to appeal again is another.