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9.3 Delta 

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Expert Level

Delta provides traders with the total sum of market orders in any given session. Experienced traders understand that only market orders move the price action. This is referred to as Active or Aggressive Order Flow.
Conversely, limit orders when filled do NOT move the price action. Institutions and traders with large positions may often choose to sell via limit orders, to avoid influencing the price action in the market.
This is referred to as Passive Order Flow
Active and Passive Order Flows go hand in hand, if no one executed an active/market order then the price would never move.