Timing of Investment a Stock Exchange

The ideal way of creation profits on the stock exchange is to buy on the bottom of the market or lowest M.P.S and sell at the top of the market or highest M.P.S.  The greatest difficulty still is that no single can be sure about when the market is at its bottom otherwise at its top or like prices are highest and lowest. Systems have been improvement to signify at what time shares should be purchased and at what time they should be sold.  These systems are Hatch system and Dow Theory.