Same thing, if there is a shift from fine dining to fast food, then fewer dollars are being spent.3.

So, we have market shift, that's what a fundamental market wide adjustment is called, a "Shift".     

The market is shifting but its not going to shift that fast.

The market has shifted.

Well, if this becomes a shared belief and a shared action, suddenly inventory increases which shifts the supply and demand equilibrium, dropping the price of residential real estate.

The market is shifting, so look at the most recent solds and current active listings to see how long they were or have been on the market. 

This makes rents go down.What causes the balance to shift?

When you go to refi the interest rates or economy may have shifted.    

College can help you by surrounding yourself with intelligent people; however, the culture of campuses is shifting to more liberal politics, and you pay to take a lot of classes that try to indoctrinate you with these ideals. 

I suppose the easy answer is "until I run out of money" or "until the market gets better" but let's suppose there is no "better", but instead a market shift (i.e. oversaturation, market loses popularity, etc) or you're unwilling to actually run out of money - what then?