Sub-economy

noun, plural economies.
1.
thrifty management; frugality in the expenditure or consumption of money, materials, etc.
2.
an act or means of thrifty saving; a saving:
He achieved a small economy by walking to work instead of taking a bus.
3.
the management of the resources of a community, country, etc., especially with a view to its productivity.
4.
the prosperity or earnings of a place:
Further inflation would endanger the national economy seriously.
5.
the disposition or regulation of the parts or functions of any organic whole; an organized system or method.
6.
the efficient, sparing, or concise use of something:
an economy of effort; an economy of movement.
7.
economy class.
8.
Theology.

the divine plan for humanity, from creation through redemption to final beatitude.
the method of divine administration, as at a particular time or for a particular race.

9.
Obsolete. the management of household affairs.
adjective
10.
intended to save money:
to reduce the staff in an economy move.
11.
costing less to make, buy, or operate:
an economy car.
12.
of or relating to economy class:
the economy fare to San Francisco.
adverb
13.
in economy-class accommodations, or by economy-class conveyance:
to travel economy.
noun (pl) -mies
1.
careful management of resources to avoid unnecessary expenditure or waste; thrift
2.
a means or instance of this; saving
3.
sparing, restrained, or efficient use, esp to achieve the maximum effect for the minimum effort: economy of language
4.

the complex of human activities concerned with the production, distribution, and consumption of goods and services
a particular type or branch of such production, distribution, and consumption: a socialist economy, an agricultural economy

5.
the management of the resources, finances, income, and expenditure of a community, business enterprise, etc
6.

a class of travel in aircraft, providing less luxurious accommodation than first class at a lower fare
(as modifier): economy class

7.
(modifier) offering or purporting to offer a larger quantity for a lower price: economy pack
8.
the orderly interplay between the parts of a system or structure: the economy of nature
9.
(philosophy) the principle that, of two competing theories, the one with less ontological presupposition is to be preferred
10.
(archaic) the management of household affairs; domestic economy