1. What is the main concept of the state space model?
The state space model incorporates the interrelated concepts of price discovery (how information is impounded into prices) and price efficiency (the informativeness of prices).
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2. What is the main idea behind the HFTs' existence?
Introducing measures to curb their activities without corresponding measures to that support price discovery and market efficiency improving activities could result in less efficient markets.
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3. What is the main question in the article?
A central question is whether there were possible benefits from the old more highly regulated intermediation sector, e.g., requiring continuous liquidity supply and limiting liquidity demand that outweigh lower innovation and monopolistic pricing typically associated with regulation.
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4. What is the role of HFTs in the stock market?
The direction of HFTs’ trading is correlated with public information, such as macro news announcements, market-wide price movements, and limit order book imbalances.
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