Throttling hyperactive robots - Message to trade ratios at the Oslo Stock Exchange
We use the introduction of a cost on high message to trade ratios for traders at the Oslo Stock Exchange to investigate the effects on market quality and fragmentation of introduction of such ``speed bumps'' to equity trading. The exchange introduced a fee payable by market participants whose orders (messages to the exchange's trade system) exceeded seventy times the number of consummated trades. Market participants quickly adjusted their behavior to avoid paying the extra cost. The overall ratios of messages to trades fell, but common measures of the quality of trading, such as liquidity, transaction costs, and realized volatility, did not deteriorate, they were essentially unchanged. This is a policy intervention where we can match the treated sample (OSE listed stocks) with the same assets traded elsewhere. We can therefore do a ``diff in diff'' analysis of liquidity in Oslo compared with liquidity of the same asset traded on other exchanges. Surprisingly, we see that liquidity, as measured by the spread, deteriorated on alternative market places when the tax was introduced, a tax that is only valid for trading at the OSE. The spread is the only liquidity measure for which we observe this difference between the OSE and other markets, for depth and turnover we do not find any differences between other markets and the OSE.
|Date of creation:||18 Feb 2014|
|Contact details of provider:|| Postal: University of Stavanger, NO-4036 Stavanger, Norway|
Web page: http://www.uis.no/research/economics_and_finance
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