The air mass source region labeled 4 on this map would produce _______ air masses. 
Definitions:
Total Product
The total amount of output that a firm produces, usually measured over a certain time period, using all available inputs.
Total Costs
The sum of all expenses a company incurs to produce its goods or services, including fixed and variable costs.
Average Variable Costs
The total variable costs of production divided by the quantity of output produced.
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