DTL, both MMs are in a position to move into control if they wish as soon as a .0001 difference opens between bid and ask. Yesterday, UBSS moved from .0051 to .0054 to .0053 and back to .0051 within a 30 minute period. These folks are very professional MMs and have more knowledge of the market the work than all of us combined. It's what they do. It's their only business. Just my opinion.
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