Capital is a way of counting the product of society. “Three new calves”. The word capitalism come from cap, and used as in new head of cattle. The great Middle Eastern and Mediterranean empires were grain and cattle ranches. This way of counting my cattle on my fingers was made extendable beyond the five fingers when it became notches on a stick or marks on a surface. The problems with that way of counting comes when we treat the marks as equivalent to the thing counted, and worse when the thing with the marks is treated as ownership of the things counted.