What is the constraint for node 2 in the following shortest path problem? 
Definitions:
Quantity Demanded
The overall volume of a product or service that individuals are inclined and financially able to acquire at a determined price.
Decrease
A reduction in amount, size, strength, or frequency.
Market Demand Curve
A graphical representation that shows the relationship between the price of a good and the total amount of the good that all consumers are willing to purchase at each price level.
Quantity Demanded
The amount of a good or service that consumers are willing and able to purchase at a specific price.
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