Microeconomics Homework help!!!?

Microeconomics Homework help!!!?




Which of the following is true?



A. The market demand is determined by vertical summation at every price level

B. The market demand is determined by horizontal summation at every quantity demanded

C. The market supply is determined by horizontal summation at every Quantity supplied

D. The market supply is determined by horizontal summation at every price level

E. C and D



Help plz asap!!





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