Lecture 1: Fundamentals Flashcards
What is positivistic economics?
Aims to describe what was and what is (sometimes: what will be)
- E.g. What are the costs and benefits of reducing emissions?
- E.g. How much does demand ↓ if the price ↑
What is normative economics?
Deals with what ought to be from a broad welfare perspective
- E.g. How much pollution should be allowed?
- E.g. Are market outcomes desirable, and if not, how can we correct?
What are total benefits?
sum of all benefits from carrying out an activity
What is the marginal benefit?
the increase in total benefit that results from
carrying out one additional unit of an activity
▪ Often measured as maximum willingness to pay by consumers
What are the total costs?
sum of all costs from carrying out an activity
What are the marginal costs?
the increase in total cost that results from carrying
out one additional unit of an activity
▪ Often measured as financial and/or opportunity costs
What is the theory of Adam Smith (1776)?
maximization of individual welfare contributes to maximization of social welfare.
According to Adam Smith (1776), how take competitive markets care of an efficient allocation of scarce means through prices? (Name 3)
▪The sum of consumer and producer surplus is maximal;
▪or the marginal costs of production equal the marginal benefits;
▪private costs and benefits equal social costs and benefits.
What is consumer surplus?
The difference of the actual price and what the consumer is willing to pay. E.g. the consumer is willing to pay 5€ for a beer, but it only costs 3€, then the consumer surplus is 2€.
What is producer surplus?
Difference between costs of production and selling price. E.g. the beer costs 0,50€ to produce and is getting selled for 3€, the. 2,50€ is the producer surplus (“his profit”)
What is reflected by slope of the demand curve?
Slope reflects the price elasticity of demand:
• “The % change in quantity demanded that occurs in
response to a 1% change in the price”
The higher the price elasticity of demand, the flatter the demand curve
Name examples for high elasticity of demand.
-bread
-soup
-paper
-water
-flour
Name examples of low elasticity of demand.
-petrol
-iPhone
-laptop
-cigarettes
-soda
Why is supply curve upward sloping?
Increasing marginal costs of production
• Short run: Law of diminishing returns (decrease in marginal (incremental) output of a production process as the amount of a single factor of production is incrementally increased, holding all other factors of production equal)
• Medium run: In a competitive market the most productive firms produce
first
Results in an upward sloping supply curve
• The market (firms) supplies more if the price is higher
Slope reflects the price elasticity of supply
• “The % change in quantity supplied that occurs in response to a 1% change in the price”.
• The higher this elasticity of supply, the flatter the supply curve
How to calculate welfare or net social value?
sum of consumer and producer surplus
What are the 3 methods of GDP calculation?
- Income Method (Labours, rent, profit of private sector businesses)
- Expenditure Method (Net Exports, consumption/government/investments expenditure)
- Output Method (value added from : Agriculture, Service, Manufacturing)
how much production/pollution is optimal and when to stop?
Marginal analysis gives the answer:
• Continue producing/polluting until MB = MC, because this maximizes
net total benefits (= total benefits - total costs)
- If MB > MC it makes economic sense to produce more; - If MC > MB it makes economic sense to produce less.
Private markets result in socially optimal production levels only if:
Private marginal costs and benefits = Social marginal costs and benefits
BUT THIS IS ALMOST NEVER THE CASE BECAUSE OF EXTERNALITIES
What is an externality?
• An externality is the unintended effect of a decision of actor A on actor B, without actor B being involved or fully represented in the decision.
• Externalities refer to unintended effects: pestering and charity do not generate externalities, these are intended actions!
How are marginal social costs calculated?
Marginal private costs + marginal external costs
What is the net cost of an externality?
Dead Weight Loss (DWL)
Provide the definition of DWL
Net loss of economic efficiency / welfare that occurs when the socially optimal quantity of production of a good or service is not achieved (may hold for positive and negative externalities)
Examples of market failure
- externalities
- imperfect competition / (natural) monopolies
- transaction costs
- Public goods (free riding)
- Ill-defined property rights
What is a public good?
A public good is a good that is characterized by non- rivalry and non-excludability
a)
Non-rivalry means that consumption of the good by one individual does not reduce availability of the good for consumption by others
b)
Non-excludability means that no one can be excluded from using the good
