Tesla Fell 14% in One Day. Five Years of Data Says That's Still Normal.

null

The speaker emphasizes the importance of using defined risk trades, such as selling strangles, iron condors, or put spreads, to mitigate the risk of large price movements. These strategies are recommended for traders who want to avoid the potential for outlier moves that could destroy a short premium strategy. The speaker also suggests avoiding large trade sizes on any single trade due to the possibility of extreme price changes.

Normal Distribution in Price Changes

Stock price changes, including Tesla, typically follow a normal distribution, characterized by a bell curve. This implies that most price changes occur within a central range, with fewer extreme movements. However, large moves, such as Tesla's 13.82% drop, are outliers that occur less frequently but still represent valid statistical events. The normal distribution is calculated using the standard deviation of actual daily returns, not implied volatility from options.

Market Behavior and Distribution

The speaker discusses how stock price changes, particularly in Tesla, deviate from a normal distribution over time, with larger price movements becoming more frequent as the time horizon increases. This deviation is attributed to the positive drift from interest rates and the inherent volatility of equities. The normal distribution still captures most of the price changes, but the dispersion widens with longer time frames.

Defined Risk Strategies and Position Sizing

Defined risk strategies, where you don't put any excessive risk in a single trade, are emphasized as making the most sense. This approach helps manage risk by limiting exposure in any one trade, which is particularly important when dealing with strategies like selling premium. The rationale is that it allows for more consistent risk management and avoids overexposure to any single position.

Why did the speaker pick Tesla for the analysis?

The speaker chose Tesla because it is a highly volatile stock, more so than the S&P 500 and most other stocks, making it a good candidate for observing deviations from normal distribution in price changes.

TakeawayHighly volatile stocks like Tesla are suitable for analyzing price distribution patterns and identifying outliers.

What does the speaker say about the distribution of stock price changes?

The speaker explains that stock price changes, particularly in Tesla, deviate from a normal distribution over time, with larger price movements becoming more frequent as the time horizon increases. This deviation is attributed to the positive drift from interest rates and the inherent volatility of equities.

TakeawayStock price changes are not normally distributed, especially over longer time horizons, and larger price movements are more common.

What is the risk of selling premium strategies?

Selling premium strategies can be profitable over time due to the dispersion of stock movements, but they require careful risk management. The speaker notes that even stocks like Tesla may not move enough for these positions to be profitable, highlighting the importance of defined risk strategies and proper position sizing.

TakeawaySelling premium strategies can be effective but require disciplined risk management and defined risk approaches to avoid overexposure.