2 million Apple bid at 1.00 from BATS

Everyday I see those huge Apple bids at 1.00 from BATS. Are these bids trying to catch mistakes what are their purpose? Skew the volume ? Mess with other algorithms?

I never see the opposite say 2 million ask at say 1.000?

I wish there was a book I could learn more about market microstructure most of the books out there are mainly "political" motivated they focus if HFT and other things are good or not while I would like to know the algorithms.

Any recommendation?
 
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