I have a lack of understanding of some market mechanics. Specifically, I would appreciate answers to a few of questions. 1) How much control over price can MMs and Specialists exert? 2) Can they control more than just interday blips and actually cause a stock to trend up or down on a daily or extended basis? (I understand supply/demand, but I'm wandering how they manipulate it and to what extent it goes on.) 3) Yesterday during the day end rally, how is it that at 3:30 everyone and anyone decides to drive the market up. How is it that everything suddenly moves in unison. Do all the retail buyers, MMs, Specialists, and institutional investors all of the sudden develop cosmic consciousness and act as a unified being? 4) A follow through to #3. How is it that sectors will move in unison? I understand that if a market bell-weather comes out with significant news, stocks within the same sector will tend to track. However, I've seen numerous cases where sectors move without any news. Do all market participants wake up that morning and suddenly think, gee, I'd like to buy financials today. As you can see, I'm missing a part of the equation and need enlightened. This might be an obvious question to you, but I'm confused.