The price elasticity of supply :a. is the slope of the supply curve. b. is the percentage change in quantity supplied divided by the percentage change in price. c. does not vary between the long and the short run. d. is always negative.

b.is the percentage change in quantity supplied divided by the percentage change in price.

Explanation:

Price elasticity of supply measures the degree of responsiveness of quantity demanded to price. It is a ratio of the percentage change in quantity supplied to percentage change in price.

Elasticity of supply can be elastic meaning an increase in price results in increase in demand.

It can also be inelastic meaning increase in price does not lead to a reasonable increase in supply.

answer; ///i believe the answer is (d) procedures to control the quailty of your product;

answer: a. the kind of population living in your neighbourhood.

the census explorer data tool by the us census bureau allows the user to zoom in on any neighbourhood within the united states and find the kind of people residing in that by race and age.  

the tool needs to needs to be used twice – once in order to find what type of people reside in a neighbourhood, and then to see the age groups of the people in the same neighbourhood.