Before the advent of 24 hour trading, markets use to close overnight. Gap risk means if you have an open position, your position can be subject to gaps so if something good/bad happens while markets are closed you won't be able to close or hedge . This means you are either very rich or very poor the next day. With 24 hour trading, you SOMEWHAT mitigate gap risk because , you might be able to hit a bid in the after hours to close or hedge your position.
That being said, having bids out there to hit does not mean you've hedged your black swan position. What if the bids are 20 handles below. Your Pnl is basically toast. So for all intents and purposes you have gap risk. Hope this clarifies a little.
That being said, having bids out there to hit does not mean you've hedged your black swan position. What if the bids are 20 handles below. Your Pnl is basically toast. So for all intents and purposes you have gap risk. Hope this clarifies a little.
