Theme 1.2 Flashcards
(75 cards)
What is demand?
This is the quantity of a good or service purchased at a given price over a given time period. Demand is different a want, as it is backed by the ability to pay. This is known as effective demand.
What does a demand curve show?
This shows the quantity of a good or a service which would be bought over a range of different price levels over time.
Why does the demand curve slope downwards from left to right?
As the price falls, the good becomes cheaper in comparison to substitute goods, and more can be purchased with a given level of income.
What is on the x and y-axis of a demand curve diagram?
Price is on the y-axis. Quantity is on the x-axis.
What is the horizontal demand curve?
This is the horizontal summation of each individual demand curve for a particular good or service.
What is a contraction in demand?
When price rises and quantity demanded falls.
What is an extension in demand?
When price falls and quantity demanded increases.
What is marginal utility?
This is the utility or satisfaction obtained from consuming one extra unit of a good or service.
What is diminishing marginal utility?
As successive units of a good are consumed, the utility gained from each extra unit will fall. The total utility will still increase, but it occurs at a diminishing rate (it won’t increase as much as it did after the previous unit).
What are the two shifts in demand curves?
Shift to the right (demand increases).
Shift to the left (decrease in demand).
What may cause an shift in demand to the right (increase in demand)
- Fall in price of complementary goods
- Rise in price of substitute goods
- Change in fashion and taste which makes certain things more popular.
- Increased advertising
- Increase in real incomes
- Decrease in income tax
- Increase in population or change to the age structure
-Increase in credit facilities.
Could a demand curve ever slope upwards?
Yes, this is due to the ‘snob effect’. People gain from value from having other people notice that they are rich enough to consume these goods. Eg Rolex watches.
Sometime known as conspicuous consumption or the Veblen effect.
What happens to demand for normal goods when income rises?
Demand increases. A normal good is something like a restaurant meal or holiday.
What happens to demand for inferior goods when income rises?
These fall in demand. E.g using public transport or shop-branded food items.
How is a increase in demand different to a increase in the quantity demanded?
Increase in demand is a shift in demand bought about by a condition of demand (e.g income). However, increase in quantity demanded refers to a change in price (movement along the curve)
What is the equation for price elasticity of demand?
Price elasticity of demand = % change in quantity demanded of good A/percentage change in price of good A.
What is Price elasticity demand?
This is the responsiveness of demand for a good or service to a change in its
price.
What are the types of price elasticity demanded?
-Elastic
-Inelastic
-Unit elasticity
-Perfectly inelastic
- Infinite (perfectly elastic)
What is elastic price demand?
This is if the PED is greater than 1. Quantity demanded changed by a larger percentage than
price.
What is inelastic price demand?
When the PED is between 0 and 1. This means the percentage change of quantity demanded is smaller than the percentage change in price.
What is unit elasticity of demand?
If the PED is equal to 1. Percentage change in demand is equal to the percentage change in
price when this occurs.
What does it mean if the price elasticity of demand is perfectly inelastic?
PED is equal to zero. The change in price has absolutely no effect on the quantity demanded.
What is perfectly price elastic in demand?
This is when any change in price would cause the demand to fall to zero.
How does elasticity change along a straight-line demand curve?
Elasticity falls as you move along the curve from the top left to the bottom right. When you’re at the mid point, demand has unit elasticity.