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To the bosses, labour power is also a commodity. Like any commodity, if there is a shortage in the number of workers available there can be a tendency for their price (wages) to rise, and conversely fall if there is an excess, for example in times of mass unemployment. For each worker the bosses employ, they also want to know the proportion of the new value created that becomes surplus value, in comparison to that spent on wages and other costs (raw materials, machinery, etc) – this is their ‘rate of profit’.
Wages
As with all commodities in the capitalist economy, the ‘socially necessary labour time’ to create ‘labour power’ determines its value. For capitalism, wages therefore need only to be paid at the minimum level required to keep workers alive and able to work, and to allow the workforce to reproduce itself, i.e. raise families, so that there is a supply of workers in future. Historically, and in some parts of the world today, the level of wages paid is indeed only that – just enough to survive on - and they can sometimes even fall below that.
But social and historical factors also play a role in determining wages. The most important of course is the history and strength of workers’ movements, both in general, as well as its organisation in particular sectors and workplaces.
The bosses always try to blame inflation on ‘excessive’ wage increases. However, the general level of wages is not related to the value created by workers, nor is it in a direct relationship with the price the bosses can charge for what the workers produce. The reason bosses resist putting up wages is the obvious one – the more a worker gets paid, the lower the profit for the bosses. In effect that conflict is the basis for class struggle.
Apart from cutting wages, what other ways can bosses seek to increase the amount of ‘unpaid labour’ that they can extract from their workers to generate profit? They can lengthen the working day – getting workers to work more hours, as unpaid overtime or perhaps with just a small increase in their wages. Marx described that as increasing ‘absolute surplus value’.
Alternatively, the bosses can try to squeeze more out of workers in the time they are working, by intensifying their working conditions. For example, the number of workers in a company can be reduced in order to load more work onto the backs of the remaining workers – so that they have to work faster and harder for no extra pay. Many workers have experienced that. The bosses can also invest in new techniques or machinery that raise the productivity of labour, meaning workers can produce more in the time they are working. These last two Marx referred to as increasing ‘relative surplus value’.
Rate of Profit
The proportion of new value created in the process of production that becomes surplus value, compared to that which goes on wages – the ratio of unpaid to paid labour - is called the ‘rate of surplus value’. And the ratio of the surplus value compared to all costs, including that of constant capital (raw materials, components, machinery, etc) as well as wages, is the ‘rate of profit’.
Companies that invest in the most up-to-date machinery tend to become the most successful because they are able to undercut others by reducing their labour costs, until others catch up.
In a socialist society, more wealth being created in a shorter time because of new technology would enable the working week to be drastically reduced with no loss in pay, sharing out the work that is necessary. It would be a democratically planned system in the interests of the whole of society, with workers able to spend more time on their lives outside work.
Capitalism, of course, isn’t primarily interested in the long-term welfare of workers. The logic of profit is that when workers are replaced with new technology, more people are thrown out of work.
46. Karl Marx (1847) Wage Labour and Capital. Available at https://www.marxists.org/archive/marx/works/1847/wage-labour/ch08.htm (Accessed 24 February 2026)
47. Inqaba ya basebenzi (1982) South Africa’s Impending Socialist Revolution. Available as an audiobook at: https://www.socialistparty.org.uk/audio/SP%20Books/South%20Africa's%20Impending%20Socialist%20Revolution%201981/ (Accessed 24 February 2026)

48. Mark Best, CWI (2023) AI automation - What impact will it have on workers and the economy? Available at https://www.socialistworld.net/2023/08/02/ai-automation-what-impact-will-it-have-on-workers-and-the-economy/ (Accessed 24 February 2026)