The stock market is the best long-term growth investment available. If you diversify your stock holdings, you can properly balance the risks and rewards. It is very hard to grow your money by investing in bonds and Treasury Bills. They may have less risk, but the reward is relatively low.
Investing in the stock market is a wise decision because it is one of the only ways you can just put the money away and let it do its work with you barely being involved. In addition, over time, the stock market has always gone up, even though it is incrementally or occasionally in large drops or spikes.
The stock market is a vastly complicated and highly unpredictable entity. Even taking its workings at face value, successfully predicting and capitalizing on its next move is no easy feat. But the fact is that the situation is even more complicated than that, as the recent financial crisis has proved skeptics right, that insider trading is a real thing, and that unless you are privy to these priviledged sources of information, you can never be sure that you know the whole story of a given stock.
While the stock market may be a wise financial option for those with money, I do not believe it is a good solution for the majority of the country. Many people do not have the money to invest in the stock market to make it worthwhile and other investments might be more adequate for their financial situation. There is also the risk that one takes when investing money in the stock market. The market could decrease and money could be lost. If someone has no money to waste, which is the case of many, then the stock market is not a wise financial decision.