Each capitalist produces as furiously as possible to capture as big a share of the market possible. It is a system of anarchy and leads to crises of overproduction. But the capacity of the market to absorb the goods produced is limited by the low wages of most workers. Nineteenth century free market capitalism has long gone. Modern capitalism is a system where monopolies dominate.
Large enterprises employ most of the workers and produce most of the goods.
Smaller, non-monopolistic production goes on but it is not decisive. The transition from free competition capitalism to monopoly capitalism happened a hundred years ago and since then monopolies have expanded to global proportions. The development of monopoly meant a degree of planning was possible, but fundamentally anarchy prevails underneath monopoly. Cartels may reach agreements to cut production, for instance, but after a period of time one will cut lose and decide there is more to be made by increasing production. Opec, the oil cartel, is a classic example.