The statement that best explains why the supply curve is upward sloping is: as the price increases quantity supplied increases.
Supply curve can be defined as the amount of goods and service produce and supplied at a particular period of time.
When the supply curve slopes upward this tend to means that as the price rise quantity supplied will as well increases or rise . This occur when higher prices of goods and service tend to offer higher profits.
Therefore the statement that best explains why the supply curve is upward sloping is: as the price increases quantity supplied increases.
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