Determine the domain of the given equation. 
Definitions:
Capital Stock
The total amount of physical goods or financial assets that a company possesses which are used in the production of goods and services.
Gross Investment
The total amount of money spent on capital assets before accounting for depreciation.
Net Investment
The amount spent by a company on new capital assets after accounting for depreciation.
Foreign Investments
Investments made by individuals, companies, or governments in assets or business ventures in another country.
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