Note that GMAT occasionally tries to pull a trick by switching a particular word and its cousin. As correctly pointed out in the previous posts Economical means thrifty, efficient. Consider this example.
My decision to drive a hybrid car was motivated by Economic considerations.
Economical considerations motivated my decision to drive a hybrid car.
The second sentence, which is shorter and punchier, may look preferable, however it is wrong! Economical means Economical means thrifty, efficient.
...
My decision to drive a hybrid car was motivated by Economic considerations.
Economical considerations motivated my decision to drive a hybrid car.
The second sentence, which is shorter and punchier, may look preferable, however it is wrong! Economical means Economical means thrifty, efficient.
...
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