Figure: Elasticity and Total Revenue 
Refer to the figure. If price falls from $60 to $40, total revenue goes ________, so demand is ________.
Definitions:
Erythropoiesis
The process of producing new red blood cells in the bone marrow.
Erythrocytes
Red blood cells responsible for carrying oxygen from the lungs to the body's tissues and returning carbon dioxide to the lungs.
Leukocytes
White blood cells that are part of the immune system, helping to protect the body against infections and other diseases.
Leukopoiesis
The process of producing white blood cells in the body.
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