is notably true of the first of the three great thoughts that we ordinarily associate with the name of Karl Marx. These three are:
1. The Materialistic Conception of History.
2. The Law of Surplus Value.
3. The Class Struggle—the third being a necessary consequence of the first two.
Now the Materialistic Conception of History was independently discovered by Engels just as Darwinism was by Wallace, as you will see by reading Engels' preface to the Communist Manifesto. But just as Wallace gave Darwin all the credit, so Engels did to Marx.
