What sex is to the biology classroom, stocks and investment riskiness is to the sophomore economics lecture hall. - Paul Samuelson

Error is a virus that tends to spread. As I have already hinted, the categories of circulating capital and of the wage fund tended and still tend to get confounded together.

I can claim that in talking about modern economics I am talking about me. My finger has been in every pie. I once claimed to be the last generalist in economics, writing about and teaching such diverse subjects as international trade and econometrics, economic theory and business cycles, demography and labor economics, finance and monopolistic competition, history of doctrines and locational economics.

Well, I will say this. And this is the main thing to remember. Macroeconomics -- even with all of our computers and with all of our information -- is not an exact science and is incapable of being an exact science. It can be better or it can be worse, but there isn't guaranteed predictability in these matters.