By 1929, electric light was everywhere.

Here is GDP per capita from 1900 to 1929.

But by 1929, certainly by 1950, we had central heating everywhere.

But by 1929, cities around the country had put in underground water pipes.

If you had based your prediction, your forecast on 1900 to 1929 you'd have predicted something like this.

The mentor of Warren Buffett, Benjamin Graham, developed his system of value investing as a result of his own losses in the 1929 crash.

Of course, when the motor vehicle was invented, and it became almost ubiquitous by 1929, that agricultural land could be used for human consumption or for export.

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.

But what I've been trying to do is something that the curators at MoMA in my department have been doing ever since the museum was founded in 1929, which is to try and see what's going on in the world and try to use that authority in order to make things better.