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A Structural Error-Correction Model of Best Prices and Depths in the Foreign Exchange Limit Order Market

  • Ingrid Lo
  • Stephen G. Sapp
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    Traders using the electronic limit order book in the foreign exchange market can watch the posted price and depth of the best quotes change over the day. The authors use a structural errorcorrection model to examine the dynamics of the relationship between the best bid price, the best ask price, and their associated depths. They incorporate measures of the market depth behind the best quotes as regressors. They report four main findings. First, best prices and their associated depths are contemporaneously related to each other. More specifically, an increase in the ask (bid) price is associated with a drop (rise) in the ask (bid) depth. This suggests that sell traders avoid the adverse-selection risk of selling in a rising market. Second, when the spread-the error-correction term-widens, the bid price rises and the ask price drops, returning the spread to its long-term equilibrium value. Further, the best depth on both sides of the market drops, due to increased market uncertainty. Third, the lagged best depth impacts the price discovery on both sides of the market, with the effect being strongest on the same side of the market. Fourth, changes in the depth behind the best quotes impact both the best prices and quantities, even though those changes are unobservable to market participants.

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    File URL: http://www.bankofcanada.ca/wp-content/uploads/2010/02/wp06-8.pdf
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    Paper provided by Bank of Canada in its series Working Papers with number 06-8.

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    Length: 30 pages
    Date of creation: 2006
    Date of revision:
    Handle: RePEc:bca:bocawp:06-8
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    1. Alfonso Dufour & Robert F. Engle, 2000. "Time and the Price Impact of a Trade," Journal of Finance, American Finance Association, vol. 55(6), pages 2467-2498, December.
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