In SPX and SPY we have 2900/291 as zero gamma meaning dealers are going to help buy stocks on a rally up to 2900/291. These levels are based on the SpotGamma options model. Over that there has to be real buyers to continue up. 285/2850 has held recently and is a large area of put open interest. That could provide support. Expect whippy markets until then unless we get solidly over 2900/291. Over that level it will be a grind. Whats needed to clear up this range is concrete, real resolution of trade and interest rate unknowns.