People want to practice before risking real money. The simulation sells the hope of being competent enough to invest eventually — and the journal analysis layer sells the hope of becoming the kind of person whose judgment improves over time. If simulation doesn't reflect real market mechanics, it feels like a toy and loses credibility. Slippage, transaction costs, and realistic price impact must be simulated.
构建一个名为“Paper”的模拟交易平台——一个真实、无风险的学习交易和投资环境。 核心功能： - 投资组合设置：用户以100,000美元虚拟现金开始。通过Yahoo Finance或Alpha Vantage API获取实时股票和ETF价格。 - 交易执行：支持市价单和限价单。模拟市价单0.1%的滑点。每笔交易1美元佣金（现实摩擦，而非惩罚性）。 - 绩效仪表板：盈亏图表（每日）、总回报率等。
