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traders have programmed their computers to track and trade off of all that information flow They are getting all of the data from all these exchanges as fast as they can get it It might have cost some of them $100 million to do it, but they can make that money back in less than a month Sincere: So it s all about reading order flow Gilani: Exactly For some time, trading venues have been paying for order flow that once went to the big market makers and specialists The more order flow, the more orders, and the more liquidity a venue can provide It all adds up to more fees But the advantage of order flow is you have the inside track High-frequency traders now have an inside track into order flow and are using it to their advantage Sincere: Is HFT the root of all of these problems Gilani: Not completely There are also the flash traders, who along with high-frequency traders, turned off their computers and helped cause the May 2010 Flash Crash Flash traders are not always the same as high-frequency traders, though plenty of high-frequency traders use flash technology Flash traders use a pinging methodology to determine the depth of the market They are pinging around to all these venues looking for the best bid and offer and then actually putting down orders behind those bids and offers to see if they can attract more volume to the bids and offers ahead of them They are using their computers to instantaneously probe order flow and to set up other computers to see what they want them to see, often to make them execute their orders It happens so fast Then they will pull their bids and offers within nanoseconds, either having executed an advantageous trade or leaving other traders holding the bag Sincere: Is that what happened during the 2010 Flash Crash Gilani: Exactly In the Flash Crash, stocks went from $40, $60, or whatever, to basically $0 That never could have happened in the old days when the specialist and market makers were responsible for keeping fair and orderly markets That would have been impossible We re definitely in uncharted territory now On the surface, high-frequency trades look like.

Arithmetic Operators + ++ -* / % String Operators + += Logical Operators && || ! Bitwise Operators & ^ | Sets a one in each bit position in which both operands bits are ones Sets a one in a bit position if the bits of one operand, but not both operands, are one Sets a one in a bit if either operand has a one in that position Evaluates to true if both operands are true; otherwise, evaluates to false Evaluates to true if either operand is true However, if both operands are false, evaluates to false Evaluates to false if its operand is true, and to true if its operand if false Joins (concatenates) two strings Joins (concatenates) two strings and assigns the joined string to the first operand Adds two numbers Increments the value in a variable by one Subtracts one number from another Also can change the sign of its operand like this: variableName Decrements the value in a variable by one Multiplies two numbers Divides two numbers Evaluates to the remainder after dividing two numbers using integer division

Now that you have an understanding of how to use sentiment surveys to monitor the crowd, we re going to do something different To learn about the next indicator, you ll need a computer and the ability to bring up a stock chart I ll take you through the process step-by-step The next set of indicators has been derived from the options market If you are familiar with options vocabulary such as calls, puts, and implied volatility, you can skip the following sidebar If you need a brief introduction to the options world, the information in the sidebar should help Options 101: Understanding Calls, Puts, and Implied Volatility There are only two types of options, calls and puts And with these two options, you can either buy or sell Although there are dozens of sexy-sounding option strategies, all of the strategies are based on the buying and/or selling of calls and puts For this book, we re interested in the buying of calls or puts When you buy a call, it is similar to going long a stock It means you believe the underlying stock will rise in price Retail investors who buy call options participate in the rising stock without having to actually buy the stock When you buy a put, it s similar to shorting a stock It means you believe the underlying stock will fall in price Retail

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