If you mean a definition then 'something that is in limited supply' (:
Water is scarce in the desert
The supply of food is very scarce in Africa.
The number of misquitoes this summer were scarce.
I can give you several sentences.Money is scarce in my house.We need to conserve scarce resources.Make yourself scarce!
When a product is Scarce, it is more Expensive.
Few things are as scarce as hen's teeth.
Scarcity can mean an insufficient supply or rarity. An example sentence would be: The Earth is developing a bit of a scarcity of water.
As raw materials became scarce, synthetics were developed.
My savings account provides scarce income.
When work was scarce he had to dip into his savings to meet his daily needs.
In many third world countries, food and medical care are quite scarce.
For some, hair becomes more scarce with age. The most basic of supplies immediately became scarce when the war broke out.