High Frequency Trading Improves Market Liquidity with 5 Best Prices.
The article examines different ways to measure high frequency trading (HFT) activity using data from the London Stock Exchange. By analyzing trading patterns and market liquidity, the researchers found that HFT proxies based on the 5 best prices in the limit order book are more accurate than those based on just the best price. They also discovered that HFTs engage in both competitive and passive trading strategies, but do not excessively participate in passive trading.