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Re: kairos post# 33427

Wednesday, 11/18/2009 11:56:17 PM

Wednesday, November 18, 2009 11:56:17 PM

Post# of 79740
That is a simplistic analysis.

To make the point more clearly.

If each trade is both a buy and a sell then why isn't each trade printed twice, once at the buy price and once at the sell price?

If you have watched the tape long enough you have seen times where the MM's do exactly that, each trade is printed twice. Ususally when it suits the MM's to show increased volume.

Are you saying that each trade is a buy and a sell at the same price? If that is true how do the MM's make any money?

If that isn't true then a buy and a sell don't exist as a matched pair because a MM is buying shares for his inventory or selling shares out of his inventory to satisfy the printed trade.

If the MM is moving shares into and out of his inventory to make up 1/2 of the buy and sell pair that you describe, then it does become a realistic question to ask if the trade is a buy from the market to the MM or a sell from the MM to the market.

If you accept the description of shares moving from the market to the MM and vise a versa then how do you score a sell from the market to the MM at the bid price?

The shares are from the market to the MM, which is clearly a sell in direction. If you score the trade as a buy becase of the price point, you have lost the actual flow of the share movement by the way you categorize the trade. That same is true of a sell at the ask price.

The truth is, there is no accurate way to classify buying and selling amounts. And the Market Makers want it that way, because it enables then to influence market perception and emotions.

The best information you can get about buying and selling is to read what posters are saying about their trades. "I got filled at the bid or I can't get a fill at the ask. I sold at the ask, etc."

Classifying trades based on whether they were at the bid price or the ask gives you the illusion of knowing something when actually you don't.

YMMV

Steady_T