Answer :
Demarcus's demand for apps is unit elastic
Explanation:
Unit elastic demand is an economic model which assumes that price changes would cause the necessary quantity to be equivalent in proportional.
There is dynamic competition that adjusts proportion to a change in price. A unit elastic demand is a result of price changes because customers have small alternatives that meet their needs.
Likewise, an elastic unit supply results in a price change when near supplies of substitutes are made.
Since a price change in the product corresponds to the same percentage growth in the amount demanded or given, the market elasticity is equal to-1 (Ed= -1) as well as the supply unit elasticity is equivalent to 1 (Es= 1).