Historical volatility is the actual measure of futures price movement from the past 历史波幅是对过去的期货价格运动的实际测量。
2.
Prudent banks lend with a " haircut " on the current asset price and the haircut is estimated on the basis of the historical volatility of the price of the asset 审慎的银行借出的款额只会占资产市值的某个成数，而成数是银行根据有关资产价格过往的波幅来厘定。
