Given the following class definition, which of the following are considered part of the class's public interface? 
Definitions:
Long-Run Aggregate Supply
The total supply of goods and services that a country's economy can produce over time when all inputs are fully utilized.
Stock Prices
The market price at which shares of public companies are bought and sold, reflecting the value that investors place on these companies.
Price Level
The overall current average price of goods and services within the economic framework.
Real GDP
Gross Domestic Product adjusted for inflation, reflecting the value of all goods and services produced by an economy in a given year at constant prices.
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