需求與供應（二）：彈性

Most Hong Kong people use either town gas or electricity for cooking. Suppose there is a drastic increase in electricity charges. Consumers’ expenditure on electricity consumption _______ but their expenditure on town gas consumption _______.

The demand elasticity of Good X is equal to one. Which of the following is a correct description of Good X ?

Suppose an increase in the demand for Good Y results in a 10% and 5% change in its price and quantity transacted respectively. Which of the following could explain the extent of the change in the price and the quantity transacted?

Mr Chan travels frequently between Hong Kong and Beijing on business trips. Last year, even though the price of air-tickets increased by 50%, Mr Chan’s total expenditure on these air-tickets remained unchanged. If Mr Chan’s demand for these air-tickets last year remained the same as the previous year, his demand for these air-tickets last year would have been

Suppose with the more popular use of iPods (portable media players), the price of the traditional MP3 players has fallen by 40% and the quantity sold has changed by 50%.

This would indicate that within that price range, there was an _______________ for the traditional MP3 player.

With the introduction of high definition television (HD TV) broadcasting in Hong Kong, more people have chosen to buy an HD TV set. Under what condition will the market price of HD TV sets remain unchanged?

The table below shows the relationship between the price of Good X and its sales revenue.

Within the above price range, the elasticity of demand for Good X is

The imposition of a per unit sales tax on a good will reduce its equilibrium quantity if

Fearing an outbreak of bird flu, people tend to consume less live poultry but more canned food. As a result, the price of the canned food of a particular brand changed by 50% and its quantity transacted rose from 1 000 cans to 1 350 cans per month. We can conclude that within the above price range this canned food had

The table below shows the relationship between the price of Good X and its total sales revenue.

Within the above price range, the elasticity of demand of Good X is