In the economy, there is a circular flow of income and spending. 1  Everything is connected. Money that is earned flows from one person to another, and most of it gets spent again - not just once, but many times.
Stage 1: excitement or arousal. A man gets an erection with physical or psychological stimulation, or both. This causes more blood to flow into three spongy areas (called corpora) that run along the length of his penis. The skin is loose and mobile, allowing his penis to grow.
the sexual climax, a series of strong involuntary contractions of the muscles of the genitalia, accompanied in males by ejaculation of semen, experienced as exceedingly pleasurable, set off by sexual excitation of critical intensity.