问题如下：
Which of the following is least likely to be a part of Monetarist school:
选项：
A.Believe business cycles are caused by government intervention.
B.Believe the changes in aggregate demand that cause business cycles are owing to changes of the money supply.
C.Believe that external shocks or inapproriate decreases in the money supply can lead the recessions.
解释：
A is correct.
Business cycles are caused by government intervention in the economy is known as the view of Austrian school.
考点： Monetarist school
解析：政府干预经济造成经济周期是奥地利学派的观点，所以A选项入选。
货币主义认为货币供给量的改变诱发总需求的变化，从而产生了经济周期。所以B选项不入选。
货币主义同时还认为外部冲击包括货币发行量的降低是造成经济衰退的原因之一。所以C选项不入选。
这里不是很明确的说，external shocks 是属于 RBC 么
