Book Image

Algorithmic Short Selling with Python

By : Laurent Bernut
Book Image

Algorithmic Short Selling with Python

By: Laurent Bernut

Overview of this book

If you are in the long/short business, learning how to sell short is not a choice. Short selling is the key to raising assets under management. This book will help you demystify and hone the short selling craft, providing Python source code to construct a robust long/short portfolio. It discusses fundamental and advanced trading concepts from the perspective of a veteran short seller. This book will take you on a journey from an idea (“buy bullish stocks, sell bearish ones”) to becoming part of the elite club of long/short hedge fund algorithmic traders. You’ll explore key concepts such as trading psychology, trading edge, regime definition, signal processing, position sizing, risk management, and asset allocation, one obstacle at a time. Along the way, you’ll will discover simple methods to consistently generate investment ideas, and consider variables that impact returns, volatility, and overall attractiveness of returns. By the end of this book, you’ll not only become familiar with some of the most sophisticated concepts in capital markets, but also have Python source code to construct a long/short product that investors are bound to find attractive.
Table of Contents (17 chapters)
14
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15
Index

10 Classic Myths About Short Selling

Since the 1975 movie Jaws, whenever we get in the water, we all have this instinctive apprehension about what swims beneath. Sharks are unparalleled killing machines. They have a better detection system than the most technologically advanced sonar. They swim faster than speed boats. They have three rows of razor-sharp teeth that continuously regrow. Yet, did you know that deep in the comfort of your home, somewhere in the dark, there is something a thousand times deadlier than any great white? There are, on average, 80 shark attacks every year, mostly exploratory bites and mistaken identity. Meanwhile, falling out of bed carries a far greater probability. Sharks are majestic creatures. If they wanted us dead, we would be. Apparently, they don't like junk food.

Short sellers are like sharks, a little less majestic, but still vastly misunderstood and not as deadly as you might think. You know you have a bit of a reputational issue when your brethren, in allegedly the most reviled industry, would still gladly sharpen pitchforks at the single mention of your profession. In this chapter, we will debunk 10 of the most enduring myths surrounding short selling:

  • Myth #1: Short sellers destroy pensions
  • Myth #2: Short sellers destroy companies
  • Myth #3: Short sellers destroy value
  • Myth #4: Short sellers are evil speculators
  • Myth #5: Short selling has unlimited loss potential but limited profit potential
  • Myth #6: Short selling increases risk
  • Myth #7: Short selling increases market volatility
  • Myth #8: Short selling collapses share prices
  • Myth #9: Short selling is unnecessary during bull markets
  • Myth #10: The myth of the "structural short"