This is incorrect. Orders and their distribution in the order book is called liquidity. Alone, they have very little meaning, and are often manipulated in the securities and commodities market(ie: you see a 5,000 bid, and place your own 5,000 ask - suddenly the bid is gone, and your ask gets rolled by huge buy orders). "Buy/sell curve" has no meaning, the closest term would be "yield curve", such as US interest rates. As the rate climbs and falls, there are inverse effects on financial instruments.
Manipulation can be 100% or 10%, who the hell knows?