e·con·o·my

noun: economy; plural noun: economies

1.
the wealth and resources of a country or region, especially in terms of the production and consumption of goods and services.

(financial) resources
financial system
financial state
financial management

a particular system or stage of an economy.
"a free-market economy"

2.
careful management of available resources.
"even heat distribution and fuel economy"

sparing or careful use of something.
"economy of words"

adjective
modifier noun: economy

(of a product) offering the best value for the money.
"an economy pack"
designed to be economical to use.
"an economy car"

Marty, what must you be able to do in order to have and sustain any stable economy?