The article explores how the speed at which money is reinvested in a business affects how much profit it makes. This idea, called the 'rate of turnover', is crucial in understanding how capitalism works. By studying new writings by Karl Marx, the researchers aim to fill gaps in our knowledge about his economic theories. They also define new concepts like the 'annual rate of profit' and the 'temporal composition of capital'. These findings contribute to the ongoing debate about why profits in capitalism sometimes fall.