Earlier quoted context omitted.
There's no reason arbitrage should push up the price of Bitcoin. Tether exists to normalize arb opportunities between exchanges. That's what it was created for. There is indeed a real question as to whether or not Bitfinex has issued more Tether than it has in reserve, or whether or not they will actually pay people out for their Tether tokens. But there is no 'arbitrage feedback loop' driving the price rise.
I'm no expert but mulling it over.... If Tether is big enough that the price of BTC is effected by it, such that investors feel they can cash out and that is part of their risk calculation, then a tank in Tether would also cause a drop in BTC. If Tether is backed by loans and not hard cold cash that's a risk and effects the value. If someone is able to buy Tether on credit, and the credit is actually backed by BTC th…
Indeed, one of the BFX employees accidentally let it out that Tethers are not backed by USD but perceived value of cryptos held by the exchange.
https://mobile.twitter.com/bitfinexed/status/935333097377329...
Anybody claiming that a loop does not exist has to be in some kind of denial.