英国大学公开课60-second Adventure in Economics(60秒读懂经济学概念).doc

60 Second Adventures in EconomicsNumber one: The Invisible Hand An economy is a tricky thing to control, and governments are always trying to figure out how to do it. Back in 1776 economist Adam Smith shocked everyone by saying that what governments should actually do is just to leave people alone to buy and sell freely among themselves. He suggested that if they just leave self-interested traders to compete with one another, markets are guided to positive outcomes “as if by an invisible hand”. If someone charges less than you, customers will buy from them instead, as you have to lower the price, or offer something better. Wherever enough people demand something, they will be supplied by the market like spoilt children-only in this case, everyone is happy. Later free-marketeers like Austrian economist Friedrich Hayek, argued that this “hands off” approach actually works better than any kind of central plan. But the problem is, economies can take a long time to reach their “equilibrium”, and may even stall along the way. And in the meantime people can get a little frustrated, which is why governments usually end up taking things into their own more visible hands instead. Number 2: The Paradox of ThriftMuch like a child getting his pocket money, one of the biggest economic questions is still whether its better to save or spend. Free-marketeers like Hayek and Milton Friedman say that, even in difficult times, its best to be thrifty and save. Banks then channel the savings into investment, in new plants, skills and techniques that let us produce more. And even if this new technology destroys jobs, wages will drop, and businesses hire more people so unemployment falls again. Simple- At least in the long run. But then a “live-fast-die-young” kind of chap called John Maynard Keynes cheerfully pointed out that “in the long run were all dead”. So, to avoid the misery of unemployment, the government should instead spend money to create jobs. Whereas if the government tightens its belt when people and businesses are doing the same, less is spent, so unemployment gets even worse. That is the paradox of thrift. So instead they should spend now and tax later when everyones happy to pay. Though making people happy to pay tax was something even Keynes didnt solve. Number Three: The Phillips Curve.Bill Phillips was crocodile hunter and economist from New Zealand, who spotted that, when employment levels are high, wages rise faster people have more money to spend, so prices go up, and so does inflation. And likewise, when unemployment is high, the lack of money to spend means that inflation goes down. This became known as the Phillips Curve. Governments even set policy by the curve, tolerating the inflation when they spent extra money creating jobs. But they forgot that the workers could also see the effects of the curve. So, when unemployment went down, they expected inflation and demanded higher wages, causing unemployment to go back up, while inflation remained high-Which is what happened in the 1970s, when both inflation and unemployment rose. Then in the 90s, umployment dropped while inflation stayed low, which all rather took the bend out of Phillips curve. But at least part of Phillips troublesome tradeoff lives on: when faster growth and full employment return, you can bet inflation will be along to spoil the party.Number Four: The Principle of Comparative Advantage.Whether you think the economies work best if theyre left alone, or that governments need to do something to get them working, the one thing that cant be controlled is the rest of the world. Fear of foreign competition once led countries to try and produce everything they needed, and impose heavy taxes to keep out foreign goods. However, economist David Ricardo showed that international trade would actually make everyone better off, bringing in one of the first great economic models. He pointed out that, even if a country can produce pretty much everything at the lowest possible cost, with what economists call an “absolute advantage”, its still better to focus on the products it can make most efficiently. That sacrifice the least amount of other goods, and let the rest of the world do the same. By specializing, they can then export these surpluses to each other and both end up better off. This is the principle of comparative advantages, and it has persuaded many countries to sign up to free-trade agreements, but unfortunately, it takes long time for countries to trade their way to prosperity. And because its much easier to move to where the money is, it increasingly not only goods that cross borders, but people which has somewhat uprooted Ricardo theory. Number Five: The Impossible Trinity. 三元论Most counties trade with one an other, which is usually pretty good for all involved, but it does mean its a big harder for each to keep control of its own finances. There are three things that governments are particularly keen on. They like to keep the exchange rate stable, so that import and export prices dont suddenly jump around. They also like to control interest rates, so they can keep borrowers happy, without upsetting savers. And they like money flow in and out of their country, without causing too much disruption. But theres a problem, when you try all of these at once. Say for example, the Eurozone tries to lower its interest rate, to boost investment and reduce unemployment. Money flows out to earn higher interest rates everywhere. Exchange rates low, which causes inflation, so the Euro interest rate is forced back up again. You can either fix your exchange rate, and let money flows freely across national borders, but have no control over your interest rates. Or control your interest and exchange rates, but then you cant stop the capital flowing in and out. But, like an overzealous triathlete, you cant do all three at once. Number Six: Rational Choice Theory.Of all the things to factor in when to running an economy, the most troublesome is people. Now by and large humans are a rational lot. When the price of something rises, people would supply more of it and buy less of it. If they expect inflation to go up, people would usually ask for higher wages (Though they might not get them.) And if they can see interest and exchange rates falling in one country, people with lots of money there will try to move it out, faster than you can say “double dip”. And government often decides economic policies, assuming such rational actions-which would be great, if it werent for the fact that those pesky humans dont always do whats best for them. Sometimes they mistakenly think they know all the facts, or may be the facts are just too complicated. And sometimes people just decided to follow the crowd, relying on others to know what they are doing. When too many cheap mortgages were being sold in 2007, a lot of people did not know what was going on, and a lot of others just followed the crowd. Some lenders may have rationally believed that, when the crunch came, the scale of the problem would force the government to rescue them, which was true for the banks-if not for all their customers.第 7 页