In principle, the embedding of small amounts of capital in the deal increases the chances that you will be able to survive the mistakes and live up to the new deal. Suppose you have a trading capital of $ 50 thousand, and you want to limit the risk of capital in the transaction 2% of capital available in the account ($ 1000). When you get a buy signal for stocks trading at 25, and the scenario dictates to you that you must withdraw from the deal at a loss if the stock moves below 21, in which case you can buy 250 shares because the triggering stop-loss at 4 points to the position of 250 shares means a loss of $ 1000. The essence of the movement of the market is not in zigzags on the chart and not the flashing numbers on the quote screen. The bottom line is people who make decisions – other individual traders and investors professional managers of capital, financial institutions and governments. Understanding (as possible) that directs these decisions – a very difficult part of trading. Consider the criterion of the transaction from question 1: "Buy when the price has risen to at least 2% above the lowest minimum for the last 10 days." This is a fairly common option price behavior, but it can bring different results depending on the specific circumstances. For example, you found 30 cases of the emergence of such a scenario over the past three years. Further analysis may reveal that only 15 of those cases followed a significant upward movement.