单选题据统计，英国2000年成年人总数大概为46500000，劳动参与率为63.5/%，失业率为5.8/%。则就业人数和失业人数分别是( )。 A．大约29500000和2700000 B．大约29500000和1700000 C．大约27800000和2700000 D．大约27800000和1700000

单选题考虑一个三部门经济模型，边际消费倾向为0.75，总量税制下的税收增加10亿美元，将导致储蓄( )。 A．减少30亿美元 B．减少10亿美元 C．增加10亿美元 D．增加30亿美元

单选题经济学家通常评价经济模型的标准是 。

单选题Since the 1930s, the idea that creatures might advertise their " fitness " as mates through symmetry has been around. It rests on the notion that factors ranging from bad genes to coming off worse in too many fights will lead to asymmetries others can see. And over the past few years, experiments with animals and humans seemed to support the idea that symmetry in features such as plumage and facial characteristics influences mate selection. But no one had actually checked that the animals in these experiments can actually see the subtle differences in symmetry, typically of between 1 and 2 percent. Now the first such experiment has been carried out. The results are worrying for advocates of symmetry detection as a powerful factor in mate selection. John Swaddle, an ethnologist at the University of Bristol, performed the experiment using wild starlings, which have excellent eyesight. He trained them to hit keys marked with bar patterns with varying levels of asymmetry in order to receive food rewards. This showed the starlings could easily detect asymmetries of between 5 and 10 percent. But at between 1 and 2 percent, their performance plummeted to no better than random guessing. " This suggests that the levels of asymmetry that birds encounter in nature will often be just too small to be detected, " says Swaddle. He says experiments that linked small asymmetries to fitness may have produced misleading correlations, and says the only direct evidence that birds use asymmetry as a cue to mate fitness involves levels of asymmetry of at least 10 percent. " I think signaling by asymmetry will probably only occur when species show such very large asymmetries—and this doesn't occur that often. " This raises questions about research suggesting that humans are influenced by visual asymmetry in their choice of partner. Michael Butt of the Perception Laboratory at the University of St. Andrews, who has carried out such experiments, concedes that no one has ever checked if humans have a threshold to asymmetry detection. He thinks a conclusive test of this would probably involve manipulating complex three-dimensional images: " It would be a very difficult experiment to do " Burt adds that the abilities of animals to detect asymmetry in bar patterns may not reflect their talent for spotting asymmetries in body shape. " The visibility of an asymmetry may well depend on its type, " he says. Swaddle agrees, and is planning further experiments. " But I suspect that asymmetry is used as a visual cue less often than most people appear to presume, " he warns.

单选题如果在某一时期内国民收入增加，则净投资肯定 。

单选题实际经济周期理论认为 是经济波动的根源。

单选题在凯恩斯区域内，

单选题在浮动汇率制度下，本国货币供给增加，

单选题衡量一国开放程度高低的标准是

单选题在封闭经济中，影响总投资的主要制约因素是( )。 A．可供投资者使用的储蓄总额 B．普遍的利率水平 C．股市行情 D．以上都不是，因为不存在这样一种单一的因素

单选题边际消费倾向和边际储蓄倾向的关系是( )。 A．由于边际收入的一部分转化为边际的消费支出，其余部分则转化为边际的储蓄支出，因而它们的和必然等于1 B．由于可支配收入划分为消费和储蓄，因而它们之和必然表示为现期收到的可支配收入的总额 C．它们之问的比例一定是平均消费倾向 D．它们之和必然等于零

单选题当消费函数为C=C0+cY，C0＞0，1＞c＞0这表明，平均消费倾向( )。 A．大于边际消费倾向 B．小于边际消费倾向 C．等于边际消费倾向 D．以上三种情况都可能

单选题在新古典经济增长模型中，均衡点是指 。

单选题假设E＄/?=3/2，E＄/￡=2。欧元和英镑之间的交叉汇率应该是多少才能保证不存在套利机会? A．E?/￡=3/4。 B．E?/￡=3。 C．E￡/?=3/4。 D．E￡/?=1/3。

单选题如果某一时期GDP不断上升，那么 。

单选题GDP缩减指数反映了( )。 A．相对于当前价格水平的基期价格水平 B．相对于基期价格水平的当期价格水平 C．相对于当前实际产出水平的基期实际产出水平 D．相对于基期实际产出水平的当期实际产出水平

单选题Many in the Middle East have difficulty in adjusting themselves to the new situation created by the departure of the imperial powers. For the first time in almost 200 years, the rulers and people of the Middle East have to accept the final responsibility for their own affairs, to make their own mistakes and to accept the consequences. This is difficult to internalize, even to perceive, after so long a period. For the entire lifetimes of those who formulate and conduct policy at the present time and of their predecessors for many generations, vital decisions were made elsewhere, ultimate control lay elsewhere, and the principal task of statesmanship and diplomacy was as far as possible to avoid or reduce the dangers of this situation and to exploit such opportunities as it might from time to time offer. It is very difficult to forsake the habits not just of a lifetime but of a whole era of history. The difficulty is much greater when alien cultural, social and economic preeminence continues and even increases, despite the ending of alien political and military domination. Military and to a growing extent political intervention by the West has indeed ended, but the impact of its science and culture, its technology, amenities and institutions remains and even increases. As in other parts of the non-Western world, this impact has been and will be enormous. In these circumstances, it is natural that Middle Easterners should continue to assume—and proceed on the assumption—that real responsibility and decision still lie elsewhere. In its crudest form, this belief leads to wild and strange conspiracy theories directed against those whom they regard as their enemies—Israel, and more generally the Jews, the United States, and more generally the West. No theory is too absurd to be asserted or too preposterous to be widely and instantly believed. Even among more responsible statesmen and analysts, a similar belief in alien power, albeit in a less crude form, often seems to guide both analysis and policy. Some even go so far as to invite outside intervention, presumable in the belief that only outside powers have the capacity to make and enforce decisions. A case in point is the constant appeal to the United States to involve itself in the Arab Israel conflict, oddly coupled with the repeated accusation of "American imperialism. " This state of mind is likely to continue for some time, with appeals for support or even intervention to the United States, to Russia and even to the European Union. In time, no doubt, Middle Eastern governments and people will learn how to use this window of opportunity to the best advantage—that is, of course, if the window remains open long enough.

单选题经济增长的标志是 。

单选题下列观点中不正确的是( )。 A．国民生产净值(NNP)减直接税等于国民收入(NI) B．国民生产净值(NNP)加资本折耗(折旧)等于GNP C．总投资等于净投资加折旧 D．个人收入等于个人可支配收入加直接税

单选题在生产函数F=ALaK1-a中，全要素生产率是指 。