6. (_a_) Enumerate some of the abuses of rate discrimination in the
United States and tell how they are met. (_b_) What are the
advantages to the public of freight organisations which arrange
for through service? (_c_) Explain in detail the methods adopted
by leading and competing railway lines to regulate and adjust
freight rates. (_d_) What are _differentials_? How are (1)
through and (2) local passenger rates regulated?
