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.