The demand for a commodity has unitary price elasticity. Which diagram illustrates how total expenditure on the commodity varies with its price?
- A[IMAGE:9708_s10_qp_11_p4_diagram_6]
- B[IMAGE:9708_s10_qp_11_p4_diagram_5]
- Cdiagram C
- D[IMAGE:9708_s10_qp_11_p4_diagram_3]