Mason, Charles <br/><br/>
Contracting for impure public goods :   Carbon offsets and additionality / 
Charles Mason and Andrew Plantinga 
 - Cambridge  NBER  2011 
 - 38p 
 - NBER Working Paper   16963 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>NBERWP 16963<br/>E4992.pdf