Now let's imagine that you were an economist in 1929, trying to forecast future growth for the United States, not knowing that the economy was about to go off a cliff, not knowing that we were about to enter the greatest economic disaster certainly in the 20th century.
Lad os nu forestille os at du var økonom i 1929, der forsøger at forudse væksten i USA, du ved ikke at økonomien snart tager et stort dyk, Du ved ikke at der venter den største økonomiske  katastrofe i det 20. århundrede.