Helpman, Elhanan <br/><br/>
Trade policy and market structure / 
Elhanan Helpman and Paul R. Krugman 
 - Cambridge :  The Mit Press ,  1989 
 - 191p. :  ill. ;  24cm. 
<br/><br/> Includes bibliographies and index 
<br/><br/><label>ISBN: </label>0262081822 
<br/><br/><label>Subjects--Topical Terms: </label><br/>International trade<br/>Commercial policy