Gemini dollar – Why?

Twins got approved to launch a stable coin called Gemini Dollar. I read it will be build on Ethereum and it will be just ERC-20 token. Can someone tell me why would we need such "stable token"? Is it just to transfer it (transferring USD fast)? Or will this be used as a payment mechanism = right now merchants are not accepting crypto because of it volatility but with stable coin there will be no problem? Anyway, then I don't understand how did we benefit? It doesn't make it any easier for merchant to accept such token than accepting USD, Visa, Mastercard today… Does someone knows?

Submitted September 12, 2018 at 03:13AM }
via reddit