更多"The quantity theory of money holds "的相关试题:
[简答题]The quantity theory of money holds that the money supply, multiplied by the rate at which it circulates (called velocity 称做周转率) , equals nominal income. Nominal income in turn is the product of real output and prices. But does money supply directly boost nominal income, or does nominal income affect velocity and the demand for money The mechanism is murky.
Central banks control the narrowest measure of the money supply, called the monetary base (货币基数) —typically, currency plus the reserves that commercial banks hold with the central bank. But the relationships between the monetary base, broader monetary aggregates and nominal income is highly unstable.
Central banks have mostly given up trying to target inflation via the money supply. Instead, they study the "output gap" between total demand and the economy’s potential to supply goods and services, determined by such things as the labour force and capital stock, as well as inflation expectations. When demand exceeds supply, i
[填空题]The （） theory is a theory of meaning which relates the meaning of a word to the thing it refers to or stands for.
[简答题]A theory is a good theory if it satisfies two requirements: It must accurately describe a large class of observations on the basis of a model that contains only a few arbitrary elements, and it must make definite predictions about the results of future conservation. Newton’ s theory of gravity was based on an even simpler model, in which bodies attracted each other with a force that proportional to a quantity called their mass and inversely proportional to the square of the distance between them.
[填空题]The bow-wow theory is a theory on the origin of language.（）
[单项选择] Genetic engineering holds great potential payoffs for farmers and consumers by making crops resistant to pests, diseases, and even chemicals used to kill surrounding weeds. But new research raises concerns that altering crops to withstand such threats may pose new risks from none other than the weeds themselves. This is due to the weeds ability to acquire genes from the neighboring agricultural crops. Researchers found that when a weed cross-breeds with a farm-cultivated relative and thus acquires new genetic traits possibly including artificial genes engineered to make the crop hardier the hybrid weed can pass along those traits to future generations.
"The result may be very hardy, hard-to-kill weeds," said Allison Snow, a plant ecologist at Ohio State University in Columbus who conducted the experiments over the past six years along with two colleagues. They presented their results last week at the annual meeting of the Ecological Society of America in Madison, Wisconsin.
A. make crops hardier
B. kill weeds through cross-breeding
C. make crops resistant to chemical fertilizers
D. improve the yield and quality of most crops
