Speculative Fever is a term used in the housing market which represents the frequent action of buying and selling housing properties. In the case of Speculative fever, the buyer and seller has no intention of ever occupying the house, only purchasing it for the sole reason of selling it off for a profit

Profit (accounting)

In accounting, profit can be considered to be the difference between the purchase price and the costs of bringing to market whatever it is that is accounted as an enterprise in terms of the component costs of delivered goods and/or services and any operating or other expenses.-Definition:There are...

. Speculative fever is one of the prominent factors taking lead to the US housing market's plummeting prices in 2008 and 2009.

Source:
International Herald Tribune: http://www.iht.com/articles/2005/03/01/business/boom.php