# The long and short riddle of the century is

(Last Updated On: October 24, 2017)

The long and short riddle of the century is

Who wants to tackle this riddle?

Hi Bryan, thank you for your amazing blog! I have also taken the PTM course. However, there’s a flaw I noticed that I would like to ask you about. Let’s say long X is \$100 and short Y is \$100. This gives us a 100/100 = Ratio 1.0, and let’s say a 30% Stop-Loss (SL) would be at 0.7. BUT!!! If long goes down to 70 and our short remains at the same price at 100, the ratio would be 70/100 = 0.7 so our SL would be triggered and everything is fine. Now to the flaw: if our long stays at the same price but our short goes against us to 130, it would be 100/130 = 0.77 which means our SL would NOT be triggered!!! So we could lose more money in our spread than intended if our short goes against us. If our long goes against us we would lose at most 30% but if our short goes against us we could lose even more at most 43% (100/143 = 0.7)… Do you see this flaw when setting SL on spreads?

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## About caustic

Hi i there My name is Bryan Downing. I am part of a company called QuantLabs.Net This is specifically a company with a high profile blog about technology, trading, financial, investment, quant, etc. It posts things on how to do job interviews with large companies like Morgan Stanley, Bloomberg, Citibank, and IBM. It also posts different unique tips and tricks on Java, C++, or C programming. It posts about different techniques in learning about Matlab and building models or strategies. There is a lot here if you are into venturing into the financial world like quant or technical analysis. It also discusses the future generation of trading and programming Specialties: C++, Java, C#, Matlab, quant, models, strategies, technical analysis, linux, windows P.S. I have been known to be the worst typist. Do not be offended by it as I like to bang stuff out and put priorty of what I do over typing. Maybe one day I can get a full time copy editor to help out. Do note I prefer videos as they are much easier to produce so check out my many video at youtube.com/quantlabs