There can be following three possible situations of total expenditure.
1. If with a rise (or fall) in the price of good, the total expenditure remains constant, then demand for the good is said to be unitary elastic i.e. |ed|= 1.
2. If with a rise (or fall) in the price of a good, the total expenditure falls (or rises), then demand for the good is said to be greater than unitary elastic i.e. |ed| > 1.
3. If with a rise (or fall) in the price of a good, the total expenditure rises (or falls), then demand for the good is said to be less than unitary elastic i.e. |ed|< 1.