Software for trading MP3s and other files across the Internet is transforming music and other digital information into public goods. However, the zero contribution thesis raises questions about why individuals would share files with others. This paper uses a logit model to identify factors...

The night sky is a unique and exquisitely valuable cultural asset that is being lost to humanity. Light pollution obscures the heavens, interferes with wildlife, and wastes billions of dollars in energy annually. Light pollution can be easily mitigated, but unfortunately, it has gone largely...