From the analysis of exchange-value it follows that the conditions of labour which creates exchange-value are social categories of labour or categories of social labour, social however not in the general sense but in the particular sense, denoting a specific type of society.
The specific type of society Marx had in mind was, of course, capitalism. The exercise of searching for terminology that wasn't there focused my attention on passages that otherwise might appear more than a bit obscure. Back in July, I identified the section titled "Necessary labour. Surplus labour. Surplus population. Surplus capital." as "the topsy-turvy concept of socially necessary labour time in embryo!"
A month later I noticed that Engels, in discussing the analytical importance of socially necessary labour time, had stated it, "already contains in embryo the whole capitalist form of production, the antagonism between capitalists and wage-workers, the industrial reserve army, crises." It's a chicken and egg question as to which embryo contains the other in embryo.
Whenever I make an earth-shattering, original discovery, I am prudently suspicious that I have only learned something I hadn't known was common knowledge in the specialized literature. It turns out that only a handful of writers have touched on the connection between Marx's category of socially necessary labour time and the fragment on surplus population and surplus capital. Fabian Arzuaga's "Socially necessary superfluity: Adorno and Marx on the crises of labor and the individual" contains the most extensive discussion of the topic. I highly recommend.
In the graphic at the top of this post, I have broken up the said passage from the Grundrisse into six captions of an almost irrelevant repurposed advertisement from a 1940s LIFE magazine.
I say almost irrelevant because the original ad featured a story about an over 50-year old middle manager who fears imminent redundancy at his current job and embarks on a new career as an insurance salesman. There is, of course, a subtle subtext to the appropriation of this image regarding the actuarial link between life insurance and population statistics, but such allusions can be left to the aficionados of Sandwichmania.
The original passage as a whole was, in effect, a "run-on paragraph" that could have easily been subdivided into six or more coherent paragraphs. I took a third of that passage and divided it into six segments of between 48 and 57 words each to replace the original insurance company advertisement's captions.
The breaks between segments was determined by physical fit in the format rather than sentence structure or flow of the argument. The resulting staccato and arbitrary emphasis of first words creates discrete units of meaning that are nevertheless connected by the continuation of the sliced sentences from one segment to the next:
Labour capacity can perform its necessary labour only if its surplus labour has value for capital, if it can be realized by capital. Thus, if this realizability is blocked by one or another barrier, then (1) labour capacity itself appears outside the conditions of the reproduction of its existence; it exists without the conditions of its existence,
and is therefore a mere encumbrance; needs without the means to satisfy them; (2) necessary labour appears as superfluous, because the superfluous is not necessary. It is necessary only to the extent that it is the condition for the realization of capital. Thus the relation of necessary and surplus labour, as it is posited by capital,
turns into its opposite, so that a part of necessary labour - i.e. of the labour reproducing labour capacity - is superfluous, and this labour capacity itself is therefore used as a surplus of the necessary working population, i.e. of the portion of the working population whose necessary labour is not superfluous but
necessary for capital. Since the necessary development of the productive forces as posited by capital consists in increasing the relation of surplus labour to necessary labour, or in decreasing the portion of necessary labour required for a given amount of surplus labour, then, if a definite amount of labour capacity is given, the
relation of necessary labour needed by capital must necessarily continuously decline, i.e. part of these labour capacities must become superfluous, since a portion of them suffices to perform the quantity of surplus labour for which the whole amount was required previously. The positing of a specific portion of labour capacities as
superfluous, i.e. of the labour required for their reproduction as superfluous, is therefore a necessary consequence of the growth of surplus labour relative to necessary. The decrease of relatively necessary labour appears as increase of the relatively superfluous labouring capacities - i.e. as the positing of surplus population.