Why is the USD spread of the order book on GDAX kept very low most of the time?
I noticed that there is a difference in the appearance of the order books among different exchanges.
On GDAX, the USD spread is kept very low most of the time ($0.01). At these times, the buy and sell orders closest to the mid market price amount to a higher BTC value than what is actually traded.
This inherently leads to a trade history that is much more stable on a short time scale, which makes me think that it has something to with "manipulation" of the current BTC price, for example by use of bots.
Other exchanges usually have a much higher USD spread (in the order of dollars), and thus a trade history which is less stable over short periods of time.
What is the reason for this discrepancy? What is the gain of forcing a more stable short-term BTC price?
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