Sometimes it's because there are nonmarket goods involved--the high value people place on personal safety, national security, a clean environment, or social welfare.
Clean environments and social welfare aren't goods that people place a high value on.
mnli hypothesis: Clean environments and social welfare aren't goods that people place a high value on. premise: Sometimes it's because there are nonmarket goods involved--the high value people place on personal safety, national security, a clean environment, or social welfare.