Social surplus is maximized in a(n) ________

Which of the following statements about the price elasticity of demand is correct?

A) The elasticity of demand for a good in general is equal to the elasticity of demand for a specific brand of the good. B) Demand is more elastic in the long run than it is in the short run. C) The absolute value of the elasticity of demand ranges from zero to one. D) Demand is more elastic the smaller the percentage of the consumer's budget the item takes up.

Saving is a ________ variable, and wealth is a ________ variable

A) stock; flow B) stock; stock C) flow; flow D) flow; stock