His plus factors may be dollars. But they might also be friendship, love, good health, a comfortable bed, a good meal, a rare book, a work of art, a day of leisure, a job, a good bridge game, or anything else his heart, body or mind desires. In this sense, man is a profit-seeker. He seeks to satisfy his desires whatever they may be. Let me provide an illustration.
Man is a land-using creature.
His habitat is land, not air and not water. He uses air and water, but land is where he lives. Our planet has a limited supply of land. Approximately thirty per cent of the earth's surface is above water and not all of that readily habitable. The total population of the world, whatever it may be at any given moment, must use the resources of this world's land to survive and satisfy human needs and wants.