The High-Frequency Trading Arms Race: Frequent Batch Auctions as a Market Design Response
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What they found
The authors show that continuous limit-order-book markets create a race that is pointless from society's view: when public information arrives, whoever is a microsecond faster picks off stale quotes, so liquidity providers must invest in speed purely defensively. Using millisecond data on the S&P 500 ETF and E-mini futures, they document that the two are perfectly correlated at human timescales but constantly decoupled for a few milliseconds, creating arbitrage opportunities worth billions that reward only speed. They propose frequent batch auctions (matching every fraction of a second) to eliminate the race.
What you can use
- In continuous markets, speed is an edge only because someone else's quote is stale; that cost is passed to all traders as wider spreads.
- Any retail 'arbitrage' between an ETF and its futures is captured in milliseconds by firms with microwave towers; do not try.
- Market design, not trader skill, determines who profits from short-term correlation breaks.
Caveats
Empirical section is about one ETF-futures pair in 2005 to 2011; the arms race has since moved to even shorter timescales. The policy proposal remains mostly untested at scale.
Tags: microstructure, hft, market-design, arbitrage
Summaries are our own reading of the paper, not the authors' words. Educational only, not advice. Discuss it in Book Club.