Careful calculations of a company's value and of demand among big investors for an IPO are important, but broader investor sentiment is more unpredictable, especially when the company has a name as familiar as LinkedIn or Facebook.

WSJ: The Art of the IPO

Dr. KARL CASE (Wellesley College): What really determines the long-term mortgage rate is some combination of inflationary expectations, international demand, the value of the dollar.

NPR: Rate Cut Benefits Consumers Some, Investors More

For of course the value of anything is determined by the balance of supply and demand for it.

FORBES: So, That's the End of Bitcoin Then