The ________ broadly we define a market, the less difficult it becomes to find ________.

The practice of tenure at American universities is quite common

When a junior professor is approved for tenure he or she is promoted to associate or full professor and enjoys for all intents and purposes lifetime employment and protection against firing in the event that he or she's views are at odds with the university administration. While this policy has been in place for many decades across the country why is it that universities are hesitant to grant and do so only after careful evaluation of the candidate's work even though the salary they may have to contract is lower than what one might receive in the private sector.

What is disposable income? How is it calculated?