You can win in Stock Prices are in low

Thebullishtrends: Yes it is true you can win in falling markets, if you applied Warren Buffets theory as he always applies the best way to make money on the stock market is to buy when the stocks are falling and sell when they are on the rise. It is true that Indian made company promoters are following this principle and they are buying their company stocks in lower levels when the markets are trading low. One side they are increasing their stake and another side they are buying in lower levels and selling their stocks in higher levels when the market recovers. One can earn profits when applied this theory is it not?