The paper can be found here: <a href="http:&#x2F;&#x2F;www.econ.upf.edu&#x2F;docs&#x2F;papers&#x2F;downloads&#x2F;1498.pdf" rel="nofollow">http:&#x2F;&#x2F;www.econ.upf.edu&#x2F;docs&#x2F;papers&#x2F;downloads&#x2F;1498.pdf</a>