SI&A is Structure Inventory and Appraisal or Site Installation and Activation.
GROSS DOMESTIC PRODUCT (GDP) is the value of all the goods and services produced by workers and capital located within a country (or region), such as the United States, regardless of nationality of workers or ownership. Domestic measures relate to the physical location of the factors of production; they refer to production attributable to all labor and property located in a country. The national measures differ from the domestic measures by the net inflow -- that is, inflow less outflow -- of labor and property incomes from abroad. Gross Domestic Product includes production within national borders regardless of whether the labor and property inputs are domestically or foreign owned.
COST is the amount of money that must be paid to take ownership of something; expense or purchase price.
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