Karl Marx promoted the idea or the principle that by
pursuing your own self – interest in a free market, you would actually be
working for the common good. This principle is self – centered which means you
need to start with your self interest in order that the common good of the
society will be achieved.
D. Clay Tablets would be the correct answer.
The California Gold Rush may be considered a pull factor, because people were being drawn to California because of the discovery of gold in that state.
Hope this helps!