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Ten Principles of Economics

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E CONOMY The word economy comes from a Greek word for “one who manages a household.”

TEN PRINCIPLES OF ECONOMICS A household and an economy face many decisions: Who will work? What goods and how many of them should be produced? What resources should be used in production? At what price should the goods be sold?

TEN PRINCIPLES OF ECONOMICS Society and Scarce Resources: The management of society’s resources is important because resources are scarce. Scarcity... means that society has limited resources and therefore cannot produce all the goods and services people wish to have.

TEN PRINCIPLES OF ECONOMICS Economics is the study of how society manages its scarce resources.

TEN PRINCIPLES OF ECONOMICS How people make decisions. People face tradeoffs. The cost of something is what you give up to get it. Rational people think at the margin. People respond to incentives.

TEN PRINCIPLES OF ECONOMICS How people interact with each other. Trade can make everyone better off. Markets are usually a good way to organize economic activity. Governments can sometimes improve economic outcomes.

TEN PRINCIPLES OF ECONOMICS The forces and trends that affect how the economy as a whole works. The standard of living depends on a country’s production. Prices rise when the government prints too much money. Society faces a short-run tradeoff between inflation and unemployment.

P RINCIPLE #1: P EOPLE F ACE T RADEOFFS. “There is no such thing as a free lunch!”

Making decisions requires trading off one goal against another. P RINCIPLE #1: P EOPLE F ACE T RADEOFFS. To get one thing, we usually have to give up another thing. Guns v. butter Food v. clothing Leisure time v. work Efficiency v. equity

Guns VS Butter

Food VS Clothes

Work VS Leisure time

P RINCIPLE #1: P EOPLE F ACE T RADEOFFS Efficiency v. Equity Efficiency means society gets the most that it can from its scarce resources. Equity means the benefits of those resources are distributed fairly among the members of society.

P RINCIPLE #2: T HE C OST OF S OMETHING I S W HAT Y OU G IVE U P TO G ET I T. Decisions require comparing costs and benefits of alternatives. Whether to go to college or to work? Whether to study or go out on a date? Whether to go to class or sleep in? The opportunity cost of an item is what you give up to obtain that item.

Whether to go to college or to work?

P RINCIPLE #2: T HE C OST OF S OMETHING I S W HAT Y OU G IVE U P TO G ET I T.

People make decisions by comparing costs and benefits at the margin. P RINCIPLE #3: R ATIONAL P EOPLE T HINK AT THE M ARGIN. Marginal changes are small, incremental adjustments to an existing plan of action.

It means to think about your next step forward. The word "marginal" means "additional." The first glass of lemonade on a hot day quenches your thirst, but the next glass, maybe not so much. If you think at the margin, you are thinking about what the next or additional action means for you. What does it mean ?

P RINCIPLE #4: P EOPLE R ESPOND TO I NCENTIVES. Marginal changes in costs or benefits motivate people to respond. The decision to choose one alternative over another occurs when that alternative’s marginal benefits exceed its marginal costs!

Sales are incentives for consumers to buy, becauseincentives firms know consumers generally respond to lower prices by purchasing more.

P RINCIPLE #5: T RADE C AN M AKE E VERYONE B ETTER O FF. People gain from their ability to trade with one another. Competition results in gains from trading. Trade allows people to specialize in what they do best.

I have a Snickers bar and want M&Ms, and you have M&Ms and want a Snickers bar, we can trade and we will both be better.

P RINCIPLE #6: M ARKETS A RE U SUALLY A G OOD W AY TO O RGANIZE E CONOMIC A CTIVITY. A market economy is an economy that allocates resources through the decentralized decisions of many firms and households as they interact in markets for goods and services. Households decide what to buy and who to work for. Firms decide who to hire and what to produce.

P RINCIPLE #6: M ARKETS A RE U SUALLY A G OOD W AY TO O RGANIZE E CONOMIC A CTIVITY. Adam Smith made the observation that households and firms interacting in markets act as if guided by an “invisible hand.”.

P RINCIPLE #7: G OVERNMENTS C AN S OMETIMES I MPROVE M ARKET O UTCOMES. Market failure occurs when the market fails to allocate resources efficiently. When the market fails (breaks down) government can intervene to promote efficiency and equity.

P RINCIPLE #7: G OVERNMENTS C AN S OMETIMES I MPROVE M ARKET O UTCOMES.

P RINCIPLE #8: T HE S TANDARD OF L IVING D EPENDS ON A C OUNTRY ’ S P RODUCTION. Standard of living may be measured in different ways: By comparing personal incomes. By comparing the total market value of a nation’s production.

P RINCIPLE #8: T HE S TANDARD OF L IVING D EPENDS ON A C OUNTRY ’ S P RODUCTION. Almost all variations in living standards are explained by differences in countries’ productivities. Productivity is the amount of goods and services produced from each hour of a worker’s time.

P RINCIPLE #9: P RICES R ISE W HEN THE G OVERNMENT P RINTS T OO M UCH M ONEY. Inflation is an increase in the overall level of prices in the economy. One cause of inflation is the growth in the quantity of money.

P RINCIPLE #10: S OCIETY F ACES A S HORT - RUN T RADEOFF B ETWEEN I NFLATION AND U NEMPLOYMENT. The Phillips Curve illustrates the tradeoff between inflation and unemployment:  Inflation   Unemployment

 Inflation  Prices  Profit

S UMMARY When individuals make decisions, they face tradeoffs among alternative goals. The cost of any action is measured in terms of foregone opportunities. Rational people make decisions by comparing marginal costs and marginal benefits. People change their behavior in response to the incentives they face.

S UMMARY Trade can be mutually beneficial. Markets are usually a good way of coordinating trade among people. Government can potentially improve market outcomes if there is some market failure or if the market outcome is inequitable.

S UMMARY Productivity is the ultimate source of living standards. Money growth is the ultimate source of inflation. Society faces a short-run tradeoff between inflation and unemployment.

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