Question

scarcity exist even when certain goods are available at zero price?​

Answer 1

Demand is more higher than requirement

Answer 2

Scarcity of product is caused when the price of that product is less and Demand of the product is high. It also depends on the population of the country or no. of people buying the product. So we can say in easy words that The Demand is higher than the Requirement as well as the pfice of product is less.