需求與供應（二）：彈性

Suppose the unit price of good X increases from $2 to $2.8 and its quantity demanded changes by 20%. Which of the following statements is correct?

When the supply of a commodity increases, its price may rise if

If there is a poor harvest of rice in Thailand, the total expenditure on Thai rice in Hong Kong

The price elasticity of demand for the Hung Hom Cross-Harbour Tunnel service would decrease if

Suppose the MTR fares on short-distance journeys (X) and cross-harbour journeys (Y) are raised by 6.9% and 13.6% respectively. If the quantity demanded for X and Y falls by 8% and 3.5% respectively, which of the following is correct?

Research shows that changes in bus fares will not affect the number of passengers who travel before 9 a.m. but will affect the number of passengers who travel after 9 a.m. which changes by a greater percentage than the percentage change in bus fares. In order to obtain the largest revenue, the bus company should

The demand for good X is

From 1990 to 1991, even though the price of private flats increased rapidly more flats were sold than in the previous year. Which of the following reasons can explain this?

If the demand is unitarily elastic along the above curve DD, then area 1 _____ area 2.

In a period of rainy weather, the price of umbrellas increased by 10% while the quantity transacted increased by 15%. What is the price elasticity of demand/supply of umbrellas in the above situation?