CS) How about if 'Yes' voters had to include a signed, blank check with
their ballot. (CS
Make that a not-to-exceed check instead, and you're very close to
"demand revelation" voting techniques a la Clarke Tideman and Tullock.
See e.g. http://www.progress.org/fold183.htm and
http://www.springerlink.com/content/n2474x5m525u0537/fulltext.pdf
The latter paper points out that the excludability / free-rider problem
in public goods is much more tractable when the good hasn't been bought yet.
