4. Ang Elastisidad ng Demand ay isang pamamaraan upang masukat kung gaano kasensitibo ang:
A. presyo sa pagbabago ng demand
B. quantity demanded sa pagbabago ng presyo
C. quantity demanded sa quantity supplied
D. quantity supplied sa pagbabago ng presyo​

Which answer best describes an advantage of shipping goods by canal? a) most towns would rather have canals then noisy railroads b) goods could travel very fast downstream in the canal system c) traveling by boat is a much more relaxing way to transport goods. d) heavy loads of goods could travel by boat more easily then if pulled by horses.