Retail food price differential and supermarket cost / price margins  a comparison between Puerto Rico and the United States 
by Arthur J. Mann, Omar Ruíz [and] Jorge I. Vélez. 
 - Mayagüez, P.R.  1979. 
 - 54 p.  tables. 
 - Research paper  no. 79-1 .
<br/><br/>Bibliographical footnotes. 
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Puerto Rico--Markets--Statistics.