Quote:
Originally Posted by parttimepro
Do you basically just sell volatility, or is there more to it?
So there is actually quite a bit to unpack on this, but here is my take on it.
If you look at a pure EV standpoint, there isn't much better you cna do that selling volatility and managing the Greeks. Regardless of asset, if you look at a long-term realized vol vs implied vol chart, you'll see implied consistently price above realized. That means vol is sort of expensive, and it's -EV to buy it.
That said, I think one thing that happens, especially on a poker forum, is that people get too enamored with EV in a vacuum. A lot of times the goal isn't necessarily to maximize EV, but do perform well on a risk-adjusted basis. That means my goal is to maximize my P&L while keeping metrics like my Sharpe ratio and VaR+ in check as well. The problem with just selling volatility is that it's hard to to this. The reason for that is that short vol positions have potentially large drawdowns, and require some active management to mitigate those losses.
Instead, what I like to think about is how to maximize my expected return, given some risk profile. For example, let's say I have 500k of VaR that I can trade in a book. A WTI straddle expiring in 2 months is $5, but my analysis shows on average it will realize $4. I can try to sell 1000x of these, but the VaR cost is something like 250k. I've exchanged $1 of EV for half my total VaR risk over the next two months. Another option is that I can trade something like a $10 wide costless collar delta-hedged. Because of the skew, I can collect $0.30 on this, and also expect to take $0.10 or so scalping the Greeks. The VaR cost of this a lot smaller, say 100k. As a result, I can put on 2.5x the size of this latter trade, collect the same expected P&L, but have much less drawdown risk.
Another really big thing that's true across the market (but particularly affects banks) is that people care about drawdowns a lot. Let's say there is something in the market that costs $1, but you know for sure that it will be worthless in six months. In the past, putting this on was a no-brainer. Nowadays, you're scrutinized a bit more, and thus might get stopped out along the way even though fundamentally trade be right (think about a scenario where the $1 thing rallies to $2, then maybe to $3 and $4). Obviously, you can't guarantee something will be "worthless" or whatever at some point in the future, but you can see that you need to evaluate value now versus what the future value of this trade may be, and try to optimize as well. Selling vol performs poorly on this as well, because it tends to blow up precisely when your position is bleeding.
One way to think about the oil market is that there are two broad types of players: passive and active. Passive guys are the ones that put on an options position and don't trade around it once it's put on (think of something like an airline that buys calls to hedge their fuel cost risk). The active market is paying attention to stuff like vols, skews, breakevens,...etc. Generally, the passive market is long vol, and the passive market is short it. The way that the active market makes money is by being short vol, but there are smart ways to manage this risk, and find good trading opportunities.
There are also some secondary things to consider. First, if the active market is generally short vol, on a big move (e.g. unexpected OPEC headline, geopolitical breaking news,...etc), everybody has negative gamma, and as they hedge this exposure, it exacerbates the move. Additionally, it's much easier to be long gamma, especially when juggling other obligations. There is a serious dollar value to not spending all my time looking at a chart and trading out of the gamma, so that shouldn't be discounted either. The last thing is that psychologically, people hate paying theta. As a result, a lot of guys will try to sell vol, especially when vols are cheap (they are collecting less theta when options are worth less, so want to sell more to collect the same dollar amount). That means there are opportunities when implied vols get cheap as well.
So, long story short, yes selling vol is the primary way the active market makes money, but there are a lot of more intelligent ways to find value, while also not risking as large of drawdowns.