Identify the structure indicated by the number 1 in the figure below. 
Definitions:
Money Supply
The total amount of monetary assets available in an economy at a specific time, including cash, coins, and balances in bank accounts.
Economic Pie
A metaphor for the total amount of wealth or resources available in an economy that can be distributed among its participants.
Standard of Living
The extent of financial status, comfortability, worldly possessions, and essentials provided to a certain community class or area.
Total Output
The aggregate production of goods and services in an economy at a given time, typically measured as Gross Domestic Product (GDP).
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