given the following welding symbols with letters (a, b, c, etc.) pointing to various components,
identify the components related to each letter.
-(in.) 
Definitions:
National Income
The total amount of money earned within a country from the production of goods and services over a specified period, usually a year.
GDP Deflator
An economic metric that converts output measured at current prices into constant-dollar GDP, stripping out the effects of inflation.
GDP
Gross Domestic Product, a measure of the total economic output of a country within a specific time period.
Net Exports
The difference between a country's total value of exports and its total value of imports.
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