在法国股市，“最小价格变动量”越大，价差就越高，相当于征收了一笔税：而他们会使波动性有所增加。
On the French stock market, coarser "tick sizes" raise spreads and act like a tax: they increase volatility.
同时，为了更精确地预测天然气价格变动，我选择BP模型的改进模型也就是偏最小二乘神经网络模型对天然气价格进行预测。
While in order to preview the change of natural gas price more accurately, I choose improved BP model-partial Least Squares Regression to forecast the price.
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