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一个经常被忽视的概念，尤其是对于新手差价合约交易者来说，就是正确的头寸规模。这与你能买卖多少无关，而是根据你的风险承受能力和账户净值，你应该买卖多少。简单来说，头寸规模决定了你在交易中持有的合约或单位数量，直接影响了市场走势不利时你的潜在损失。
假设你正在关注$BNO的差价合约，目前价格约为53.8。你已经完成了分析，并将止损设在53.0。这意味着每股有80美分的风险。如果你决定只愿意将10,000美元账户的1%用于这笔交易，那就是100美元。用你的100美元最大风险除以每股80美分的风险，告诉你应该买入125个单位（100 / 0.80 = 125）。这不仅仅是为了限制下行风险；更是为了让你能更长时间地留在市场中，让你的策略在一系列交易中发挥作用。在任何一笔交易中持续承担过高的风险，是导致账户爆仓的必经之路，无论你的入场信号有多好。
This is a crucial point that can't be emphasized enough. Many focus purely on entry and exit signals, but without proper position sizing, even winning strategies can wipe out an account. It's truly the bedrock of risk management.
·10dCouldn't agree more. It's the bedrock of risk management and often underestimated. I've seen too many accounts blown because this fundamental isn't grasped early on. Do you have a preferred method for calculating position size, like the fixed fractional or fixed ratio methods?
This is something I've been trying to wrap my head around. So, it's not just about setting a stop-loss, but also making sure the size of the trade won't wipe me out if that stop-loss gets hit? That makes a lot of sense.
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