请教一道逻辑题, 想不通啊.....

fly989

There are fundamentally 2 possible changes in  an ecomony that will each cause inflation unless other compensating changes also occur. There changes are either reductions in the suuply of goods and services or increases in demand. In a prebanking economy the quantity of money available , and hence the level of demand ,is equivalent to the quantity of gold available.
If the stataments above are true, then it is also true that in a prebanking economy.

A. any inflation is the result of reductions in the supply of goods and svervices.
B. if other factors in the ecnonomy are unchanged, increasing the quantity of gold available will lead to inflation
C.if there is a reduction in the quantity of gold available, then other things being equal, inflatin must result
D. the quantity of goods and services purchasable by a given amount of gold is constant
E.whatever changes in demand occur, there will be compensating changes in the supply of goods and services.

正确答案是B， 哪位帮忙解释下？

fly989

嗯， 这次懂了， 多谢

tenbcc

文中指出'..., and hence the level of demand, is equivalent to the quantity of gold available'
这说明level of demand 和 quantity of gold available 是正相关的

那么B选型, 其他变量不变, increase QoG --> Level of Damand --> inflation. 是很直接的推理

A错在除了供给减少, 需求增加也能导致inflation.
C错在如果QoG减少, 按照文章逻辑通货膨胀不可能发生.
D错在文中根本没有提到'购买力'.
E错在文中没有指出一定会有其他compensation.