You can buy when the price is low and when prices fall and sell when it rises again and you must be able to do this method to be able to get a lot of profit
Traders are in favor of this strategy because they look for maximum profit as a result of using low amount in the beginning in low market and then selling of it in high market will generate maximum profit. On the other hand if you buy on normal or average price you will not get benefit in terms of savings as you will get it only in low market so consider low market as the best starting market.