Patent ID: 8417619

Claim:
A computer implemented method for controlling price movements in a trading market based on electronic trading, the method comprising: determining, by a computer, an indicative market price (IMP) based on a first event in a trading market, wherein the IMP is a price value that tracks a market event of a type; maintaining, by the computer, an upper limit and a lower limit such that orders outside the upper limit and the lower limit are rejected and the IMP is within the upper limit and the lower limit such that a gap between the upper limit and the IMP is within a predetermined range of a gap between the lower limit and the IMP; changing, by the computer, the IMP responsive to a second event in the trading market; responsive to the change in the IMP, changing, by the computer, the upper limit and the lower limit to maintain the gap between the upper limit and the IMP and the gap between the lower limit and the IMP; and responsive to detecting the IMP hitting the lower limit a predetermined number of times within a time interval of predetermined size, adjusting the lower limit, by the computer, the adjusting comprising: reducing the gap between the lower limit and the IMP; and maintaining a smaller gap between the lower limit and the IMP compared to the gap between the upper limit and the IMP.