ERX

In this article I will walk you through the commonly used but wrong way to think about volatility decay.We'll then walk through an example of volatility decay with realistic numbers.Afterwards, we'll build a simple mathematical model to calculate volatility decay from first principles.We'll compare the model with back-test simulations done on portfoliovisualizer.com.

The energy sector ([[XLE]] -1.9%) drags along at the bottom of today's leaderboard, continuing its recent weakness that has seen a ~6.5% slide so far this month.Four of the five

Crude oil futures (CL1:COM) slide, adding to their biggest weekly loss since June, weighed by concerns over weak demand prospects and strength in the U.S. dollar.The greenback enjoyed a boost

WTI crude oil (CL1:COM) reverses course to turn sharply lower despite a hefty drop in U.S. crude supplies, as gasoline demand fell over the latest week, an indication that economic