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economy1
S3, W1
noun

1 [countable] the system by which a country's money and goods are produced and used, or a country considered in this way: a capitalist economy | the burgeoning economies of the Pacific rim

2 [uncountable] the careful use of money, time, goods etc so that nothing is wasted: For the sake of economy, I hadn't yet turned on the heating. | economy drive (=a period of time during which you try to spend less money than usual)

3 [countable] something that you do in order to spend less money: One economy would be to take sandwiches instead. | make economies: We're trying to make a few economies this month. | false economy (=something that seems cheaper but costs more in the end): Buying cheap tyres is a false economy - they wear out much more quickly.

http://www.cogsci.princeton.edu/cgi-bin/webwn?stage=1&word=economy

Отвлекись на секунду от прямого толкования Значения № 1 и посмотри на наполнение смыслом оставшихся двух значений. Потом сведи все в одну парадигму :))