Quote:
Originally Posted by Hunter99 When I switch between binary and decimal pricing modes on the betting site I use I notice that the spread in binay mode is approximately 6 points and in decimal mode the equivalent spread is 0.2. This represents a 12% spread for the binary price and a whoping 20% spread for the decimal price! I cannot understand how this difference can be justified for what is effectively nothing more than a different way to display the prices? 
You can't use the absolute difference to calculate spread for decimals odds, e.g. 1.01/1.04 vs say 25/1000 , i.e. you have to take it as a proportion compared to the odds. The spread is usually around 0.2 when the odds are around 2.0, thus the ~12% spread.
Since decimal and binary odds are equivalent, they will be a precise conversion of each other and the spreads will always be exactly the same (if they weren't, you could use one particular form of odds to get an advantage).
Remember also that they will also vary the spread during times of high or low volatility.
