Some Analytical Results for Models of the Bid-Ask Spread

Sunil K. Parameswaran and Sankarshan Basu

Business and Management Research, 2020, vol. 9, issue 3, 34-45

Abstract: The focus of this paper is on order processing models of the bid-ask spread, also termed as fixed-cost models. While other theories have been advanced to explain spreads, such as inventory holding costs and adverse selection, research indicates that the fixed cost component constitutes the bulk of the observed spread. This paper starts with the Roll model and the subsequent extension of Choi, Salandro and Shastri. It takes cognizance of the implications of such models for the observed stock prices and the mid-points of bid-ask quotes, to set up tests using the Generalized Method of Moments (GMM) technique. The paper develops an analytical variance-covariance matrix for the fixed cost model with instantaneous adjustment of prices to new information.

Date: 2020
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