Hmm i feel like this could have any number of effects. Since the majority of meseta is in the hands of a small subset of extremely rich players (pretty much how almost all economies in games and irl end up being) its hard to know exactly how this is gonna impact normal players. On one hand we could see a soft reset on the economy before Elder farming was abused by a lot of meseta being purged from the market into usable items from an influx of player spending AC items/badges. So all of that taxed meseta get thrown into the void. Or itll just be the exceedingly rich scalpers just buying everything and doing a massive mark up on items just because they have the ability to abuse the market endlessly knowing people will be desperate to get the swap shop items before they go away and the tax just doesnt do anything while prices just keep going up.
Basically i have no clue lol.