People want objects. People consume objects and want more. Some objects are permanent on the relevant time scale. There are kinds of people and kinds of objects. People have attributes, and these attributes change, although some are permanent.
People buy objects with money.
This uses up money and people do not buy at a rate much higher than they get more money. We suppose these are spelled out in some literature. There is an is-a hierarchy of food. Although it is tempting to organize facts into is-a hierarchies, this is not always possible or appropriate. More complicated predicates and functions and logical assertions are sometimes needed to express the facts.