My dad invest money in stock markets, and sometimes he talks about it with me. He said that people should split their own wealth into three parts. One third should be saved as cash, so people can use it anytime in need, the other one third should be used to buy lands or houses that cannot be sold easily, and the other one third third can be used to buy stocks or other investments. I think this is a pretty safe plan since it can prevent one from having no cash, but still have money to invest. If one use up all his or her money to invest, he will lose all of it when economy problems occur. And using all the money to buy lands is also a bad idea because it is hard to sell it and make money in a short time. Therefore, I think the plan is a good one, however I think it does not necessary need to be split equally into three parts. People can have enough cash they need with them or places they can access easily.