Shaffer's rounds of spending chapter explains it better than the wikipedia article: http://www.rri.wvu.edu/WebBook/Schaffer/chap05.html http://www.rri.wvu.edu/W

Shaffer's rounds of spending chapter explains it better than the wikipedia article: http://www.rri.wvu.edu/WebBook/Schaffer/chap05.html http://www.rri.wvu.edu/WebBook/Schaffer/chap05.html (not sure why I jumped to wikipedia first).