After the posthumous publication of Marx's Grundrisse in 1939, it became clear that a dialectic of simultaneity and non-simultaneity had been implicit in Marx's thinking on the spatiality and geography of capitalism. Das Kapital (1867–94) had argued on the one hand that the money form had arisen in order to allow for non-simultaneous or delayed exchange of commodities (as opposed to face-to-face bartering), and on the other that "simultaneity" (Gleichzeitigkeit) was a requirement of (and a phenomenon produced by) the demands of commodity production (the capitalist has to be able to synchronize the disparate activities required to manufacture a product). The powerful spatio-temporal effects of the dual demands of exchange and commodity production were summarized in the Grundrisse with the concept of "the annihilation of space by time", i.e. with the imposition of simultaneity or synchronicity over spatial separation and geographical diversity: