What is the primary mechanism through which capital accumulation occurs in a capitalist economy?

In a capitalist economy, capital accumulation primarily happens through the process of investment and profit generation. Businesses invest money to produce goods or services, and when they sell these products, they earn profits. This profit is then often reinvested into the business to expand operations or improve production, which leads to more profits over time. For example, a coffee shop might use its earnings to buy better equipment or open a new location, allowing it to make even more money. However, this process can also involve exploitation, as workers may not receive fair wages for their labor, allowing owners to keep a larger share of the profits.