Help me

Hi,
It means - How scarce it is.  Normally the scarcity determines the price.....  Diamond is worth only because it is scarce (if it was common on the ground as other stones no one would pay for it). 
best regards,

Scarcity means the quality or condition of being scarce; smallness of quantity in proportion to the wants or demands; deficiency; lack of plenty; short supply; penury; as, a scarcity of grain; a great scarcity of beauties.

You can search yourself for Scarcity Definition or other definitions using OXID DICTIONARY. 

insufficient for the demand (especially with food, money, resources), occurring in small numbers or quantities.

Sentence: As raw materials became scarce, synthetics were developed.  

 The freshwater shrimp becomes scarce in soft water. 

-Scarcity is the noun for the adjective scarce.  I hope this helps.