As shown on Map 30.3: The European Union, 2016, which new members joined in 2007? 
Definitions:
Marginal Cost
The change in total cost that arises when the quantity produced is incremented by one unit.
Marginal Cost
The extra expense associated with the production of an additional unit of a product or service.
Equilibrium Price
A market condition's price point where the quantity of goods producers wish to sell equals the quantity consumers wish to buy.
Production Functions
A mathematical representation of how inputs are transformed into outputs in the production process.
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