alt Hacker NewsRetailers don't accept crypto not because of the technology so much as the fact it is a capital gains event every time you transfer crypto, which means both the buyer and seller are now forced to keep a log of their gains/losses against the dollar everytime they buy a pack of gum.
Obviously that's extremely impractical and at best you're hiring a 3rd party to streamline that for you. It's a clusterfuck at tax time (edit: stable coin doesn't help here -- you must still report gains on stable coins as it is still a $0 capital gain which is different than no capital gain).
Retailers already dealing with capital gains and with high chargeback rates love it though. For instance, it's usually the cheapest same-day clearing way to buy precious metals online since credit card rates are high (chargeback), ACH takes days, and wires tend to cost $15+ with many banks.
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You do not need to report a $0 capital gain when using stablecoins. Sure crypto can seem like the wild West with CPAs having different opinions on what little official guidance is out there but that one is simply absurd.
Reticence among retailers predates the capital gains policy of the IRS. The volatility of Bitcoin's value induces excessive exchange risk. However, we don't see capital gains nor exchange risk with stablecoins. I assume that network effects are insufficient to drive retail demand for stablecoin support.