I have a question.

Question

In a competitive market demand will always reflect all spillover benefits?
Or supply will always reflect all spillover costs?

Thanks!

Since this is not my area of expertise, I searched Google under the key words "spillover benefits costs demand" to get these possible sources:

http://www.oswego.edu/~spizman/chp17.html
http://minneapolisfed.org/econed/essay/topics/topic03.cfm
http://www.ces.ncsu.edu/resources/education/sd8/
http://66.102.7.104/search?q=cache:XXJOvSqcpw8J:www.class.csupomona.edu/ec/aebres/ec201/lecture12.doc+spillover+benefits+costs+demand&hl=en&gl=us&ct=clnk&cd=9&client=safari
http://66.102.7.104/search?q=cache:KUee-plqB0kJ:www.dfid.gov.uk/pubs/files/edcostanedpaper02.pdf+spillover+benefits+costs+demand&hl=en&gl=us&ct=clnk&cd=17&client=safari

Your search for answers might be aided by using the <Find> command for the key words.

I hope this helps. Thanks for asking.