A commodity is something that is normally bought and sold. Not everything is a commodity. Sure, most people need to purchase a certain amount of food, clothing and housing, but many other things that we value are not for sale.
For example, simply purchasing exercise equipment will not make you physically fit – it requires effort. Similarly, health, safety, education, rewarding personal relationships, community and our satisfaction with life are aspirations that depend more on our behavior than on how much we spend.