ABSTRACT
The first essential in any scientific study is a possibility of comparison. The measuring-rod, the stop-watch, and the balance are at the very roots of science. The most fundamental level is the technical level. This may be Marxism, but it is also common sense. There could be no freedom of the press before printing was invented, because there was no press to be free or unfree. Economic restrictions on freedom are of primary importance. A vast number of technical possibilities are only open to a small minority. Very few people can own a steam yacht. Somewhat more can own a grand piano or an automobile. Imprisonment is the very negation of freedom. Freedom to go where one wants to is a very important kind of freedom, if only because one can escape from many kinds of bondage provided emigration to a freer country is possible.
