The NYSE has opened the limit-order book to off-exchange traders during trading hours. In this paper, we address the welfare implications of the recent change in market structure. We model a market similar to the single-price auction that the exchange uses to open the trading day. We consider two different environments. In the first, only the specialist can see the limit order book, while in th...

We show that two open books in a given closed, oriented three-manifold admit isotopic stabilizations, where the stabilization is made by successive plumbings with Hopf bands, if and only if their associated plane fields are homologous. Since this condition is automatically fulfilled in an integral homology sphere, the theorem implies a conjecture of J. Harer, namely, that any fibered link in th...

the examination of the blood, the taking of specimens of blood, the staining and microscopic examination of the blood and the great necessity of being acquainted with thtf appearance of normal blood. The three species of parasite, other' blood parasites, the method of collecting sample of blood for serum diagnosis, the examination of sputum, etc. These subjects are rightly included in this book...