Your new word for the day.

Spartaneity \ˌspär-tə-ˈnē-ə-tē, -ˈnā-\ n. The act of suddenly embracing frugality and austerity in one's life, because the situation requires it or makes it advantageous to do so.

Etymology: Combination of the words "spartan" and "spontaneity".
[ ref. http://blogs.consumerreports.org/home/2009/01/spartaneity-merrill-lynch-john-thain-economic-downturn.html ]