Theories without facts may be barren, but facts without theories are meaningless.

The trouble with taxonomic boxes is... that that they tend to be empty, however beautiful they are on the outside.

The tourist business is a trap, it is a tained honey; Man clearly should have stayed in bed, and not invented money.

The discounting presumably is to be done for each period of time at that rate of interest which represents the alternative cost of employing capital in the occupation in question; that is, at the rate which the entrepreneur could obtain in other investments

The future is bound to surprise us, but we don't have to be dumbfounded.

[The question for the behavioral disciplines is simply] what is better, and how do we get there?

The economy of the future might be called the "spaceman economy," in which the earth has become a single spaceship, without unlimited reservoirs of anything.