Information plays a role in all markets.
When information on these things is plentiful, public or easy to get, and reliable, the simplest kind of supply and demand theory may be applicable. When information on these things is limited, unreliable, and more easily available to some people than to others, the simplest kind of market theory does not apply, and markets may not be as effective. On the other hand, some organizations and enterprises exist mainly for the purpose of supplying information goods and services. All the same, there are some connections between the two meanings. In this chapter, however, these issues will largely be ignored.