What is an example of unit elasticity?

Answer 1

For unit elasticity total expenditure is a constant independent of price. Goods that would exhibit this behavior would be non necessities like toys, entertainment, or eating dinner in restaurants where people budget how much to spend and buy less if the price increases.

Answer 2

Any good where say a 10% drop in price produces a 10% increase in quantity demanded. (or 1% drop producing a 1% increase, etc)