The M–C–M is a way of explaining how capitalists maintain and increase their wealth within a capitalist economy. Each diagram can represent a step in a process making profit. The process begins with M which stands for Money because a capitalist starts with a sum of money. Then this money is used to purchase C commodities. These commodities are not finished goods but they include production like machines, tools and raw materials while labor power are the workers able to work which capitalists hire through wages. Commodities are brought together while production takes place, Workers use the means of production to create new goods or services. During this stage workers produce more value through labor than the value of the wages they are paid.
After production is complete the capitalist sells the newly produced goods on the market. The other M is for money prime which represents the original money and additional profit. This cycle starts with money, investing within production. Capitalist maintain and also expand their wealth . They spend money on goods for personal use which is M–C instead of investing to have more money. The key to this exploitation of labor power is workers that are paid less than the value what they are producing.