A postmanteau of economics + cumming: the 'study' of sexual partners; analysis of one's socio-sexual circumstances from a supply-and-demand point of view.
A person experiencing a high demand for sexual action from multiple prospective partners is said to be in a good ecumomic position: "Oh man, she is going out with five guys at the moment. I'd kill to be in her ecumomic situation!"

Conversely, one without any sexual prospects at a given time is said to be in ecumomic drought: "Oh my god, NO chicks are into me right now! I feel like I'm in an ecumomic recession... there are no jobs out there for me right now."

(Ecumomic is the most frequently applied form of ecumomics.)
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Derived from the physics principle of Newton's First Law:

The First Law of Ecumomics states: "A dick/pussy getting action will tend to continue to get action, while a dick/pussy not getting any will tend to continue to not get any, unless acted upon by an external makeover force." Also known as ecumomic inertia.
"I just keep getting pussy lately! I don't think it's ever going to stop. Thank goodness for the First Law of Ecumomics!"
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