The figure below shows the relationship of the quantity demanded for coffee beans to the price of coffee beans at a local coffee shop. 
(A)If the price of coffee increases from $6 per pound to $10 per pound, by how much will the quantity demanded for coffee change?
(B)Explain how your answer in part (A) relies on the ceteris paribus assumption.
Definitions:
Incremental Cost
The additional cost associated with producing one more unit of a product.
Step-Wise Cost
Costs that remain constant for a certain level of activity but jump to a higher amount once a threshold is crossed.
Fixed Cost
Overheads that stay stable no matter the production or sales figures, involving costs like property rent, employee salaries, and insurance policies.
Relevant Range
The span of activity level or volume in which the specific assumptions of cost behavior are considered to be applicable.
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