I am not investing in US stock market because I expect problems to come in the next year or two.
I am not buying shares.
In the US market, some of the stocks like Apple and Google go up every day. They never go down, which is a dangerous sign in any stock markets. When you have a few stocks always going up and the movement has been concentrated and that seems to be what is happening in the US stock market.
Related trading instruments: SPDR Dow Jones Industrial Average ETF (DIA), SPDR S&P 500 ETF Trust (SPY), Nasdaq 100 Futures