Quote from Pa(b)st Prime:
A carry trade-whether it's capturing currency yield differentials or borrowing at 2% and lending at 6%- is an identical risk profile to a short put on the spread. The "premium" collected is the yield diff. Leveraged of course. I used to look at returns and think, "how can these guys be so friggin' good". Now we all know it was Russian Roulette......
The thing that's mos annoying about the carry trade is that so many people think it's arbitrage.
It's a bet on the slope of the curve or a straight up currency bet. What it's not is an arbitrage. It isn't even stat arb because if you hedge it, you will make no money. There's no alpha.
These guys looked so good because they were winning in their trades and the ones that weren't went belly up and didn't advertise their failure.