'Business' in the Bible

Sometimes a man is all alone with no companion; he also has neither son nor brother. Yet there is no end to all his toil, and his eye is not satisfied with wealth. [He laments,] "For whom am I toiling and depriving {myself} of pleasure?" This also [is] vanity--it is an unhappy business!

I applied my mind to know wisdom and to understand the business that is done on earth--how neither day nor night one's eyes see sleep.