What is the most important thing that economics taught me? I just read some news and discussions about free medical system in China. A few people argue that once the free system is estimated, the government only need to spend around 800 billion yuan a year to keep it works. However, I think this argument is really ridiculous. Not only the money spent here can only help people to get very basic medical treatment(since you have to pay over 500 yuan for a simple cold treatment recently), but also this reform must put the horrible and complicated system into a much more worse situation. Because as we know the medical resources today are very scarce, hospitals don't have enough beds and nurses for patients and doctors work almost 10 hours a day and 6 even 7 days a week. That means if the free system is really estimated, there will be too much patients for hospitals to take care of(the cost for you is 0 so you may want to go to hospital now even if you did not think necesserarily to see a doctor before, assuming that you get a same illness). Maybe someone will say, the government has much money so they can spend more on medical. Yes that's true. However, that also suggests governments need to put resource from other places into medical, maybe education, infrastructure or something else. And more essentially the problem is still that there are always more patients than we can take care for free, given the huge population in China and the comparatively scare medical resources. Actually, the medical debate is not only one example that many people can not see the difficulty we face everyday. They keep saying more is better, more is better. maybe they think if there is "more" enough, the world would not have any problems!but that is just some pie in the sky. Economics tells me that source is scare and, very importantly, we have to make choices. We have to decide what we need and what we have to give up.

如何用英语表达内心挣扎的感觉 请问如何用英语表达“内心挣扎着要不要做某件事”？ 例如：她在心里挣扎着到底要不要吸一口烟。

The basis of basic economic growth theories Economic growth theories try to answer a very important and also interesting question: why different countries have different economic growth rates, or, why are there rich countries and poor countries. Lucas, a Nobel on economics winner, once said, when people began to think about this fascinated question, they wouldn't have time to think about anything else. There are basically two ways to explain this phenomena: the earlier one is called exogenous growth theory and the modern one is called endogenous growth theory. The difference between them is that whether technology is in the model or not. The exogenous theory takes technology as a given factor which means economic players can not change it, so the conclusion is that when time goes by, countries will eventually have the same growth rate. That is called convergence. However, the endogenous theory makes technology as a variable in models so that people can change it with capital or human resource. So from endogenous theories we can derive that if a country invest more resources in R&D sector, they will have a better economic performance.

Microeconomics I am currently studying advanced microeconomics at graduate school. The theories in the discipline describes human behaviors at market by using mathematical tools. The fundamental assumptions are that people are rational and resources are scarce. So we always face a choice problem, which is that how to use the finite resource to get max profits.

GRE exam I am preparing for my GRE exam now. The exam is designed for people who want to apply for a postgraduate degree, which contains three sections, quantitative reasoning part, verbal reasoning part and analytical writing. Although I just began to read the official guide book last week, I found that the mathe part is really easy for me. There are a few questions about algebra, arithmetic, geometry and data analysis in the part, which, however, are just that I learned in middle and high schools. So I can easily solve those problems. The real challenge for me, a medium level English learner, is the verbal part. There are so many words I don't know and some questions that I even can't understand! I know I have to remember lots of unusual, complicated words that maybe only used in this exam, but the process is really killing me. I found there are so many different words which have the same meaning and so many words that every one contains different meanings. Maybe today I remember 300 new words, however, when tomorrow comes, at least 60% of which will be totally new for me, again! I really want to know if this part is hard or easy for English native speakers and how does other nonnative speakers go through this remembering and forgetting hell. At last, I know there may be no easy way in the vocabulary problem, so if I want to success in the exam, I should better spend much more time on remembering words.