The misery of being exploited by capitalists is nothing compared to the misery of not being exploited at all.

owning capital is not a productive activity.

Not only subjective poverty is never overcome by growth, but absolute poverty is increased by it. ... Absolute misery grows while wealth increases.

It is the rate of investment which governs the rate of saving, and not vice versa.

The very nature of economics is rooted in nationalism. ... It [was] developed ... in the hope of throwing light upon questions of policy. But policy means nothing unless there is an authority to carry it out, and authorities are national.

Rosa Luxemburg maintained that the capitalist system can keep up its rate of investment (and therefore its profits) only so long as it is expanding geographically.

It is much easier to organize control over one industry serving many markets than over one market served by the products of several industries.