(Figure: Saving, Investment, Government Spending, and Net Exports) In the graph above, if full employment income is $500 while the current equilibrium is $750 at point a, _____ gap exists, such that _____ in aggregate expenditures equal to _____ is needed to close the gap. 
Definitions:
Interest-Bearing Note
A debt instrument in which the issuer pays interest to the holder, usually at a fixed rate, until the note reaches maturity.
Interest Revenue
Income earned from lending money or investing in interest-bearing assets.
Maturity Value
The total amount that will be paid to an investor at the end of a fixed income security's life, including principal and interest.
Interest-Bearing Note
A debt instrument that accrues interest over time, to be paid to the lender at maturity along with the principal amount.
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