Z
Zone of Rate Flexibility:
Railroads may raise rates by a percentage increase in the railroad cost index
that the ICC determines; the railroads could raise rates by 6 percent per year
through 1984 and 4 percent thereafter.
Zone of Rate Freedom:
Motor carriers may raise or lower rates by 10 percent in one year without ICC
interference; if the rate change is within the zone of freedom, the rate is
presumed to be reasonable.
Zone of Reasonableness:
A zone or limit within which air carriers may change rates without regulatory
scrutiny; if the rate change is within the zone, the new rate is presumed to be
reasonable.