Use the following to answer questions: 
-(Table: Production Possibilities for Machinery and Petroleum) Look at the table Production Possibilities for Machinery and Petroleum. The opportunity cost in the United States of producing 30 units of petroleum is _____ units of machinery.
Definitions:
Freud
Sigmund Freud, an Austrian neurologist who founded the discipline of psychoanalysis and made significant contributions to psychology.
Genital Stage
In psychoanalytic theory, the final stage of psychosexual development, typically beginning at puberty, where sexual interests mature into adult genital sexuality.
Personality States
Specific, temporary modes of behavior, thought, or emotion that can vary significantly from a person's usual baseline, influenced by situations or internal changes.
Persistent
The quality of continuing steadfastly or firmly in a course of action in spite of difficulty or opposition.
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