Limit expansion
The exchange moving the boundaries of the price corridor when the price rests against a limit.
How to read the number
The mechanism lets the market keep moving without wrecking the clearing: the corridor opens in steps under rules published in advance.
When the metric lies
Expansion almost always arrives together with higher collateral requirements. The chance to get out appears exactly when the account needs more money than it did yesterday.
Also known as: widening of price limits