In the last two cases (I don't have data for the 1930') even though, the October 1966 was just the first shot of the 1966/82 secular bear market, and yet it had a volume spike. I don't have the rest of the data for comparison, but I checked the other two weeks after the bottom in other bear bottoms (I posted here) and leadership was evident within a week of the bottom. Here, while the new highs are expanding nicely as such leadership could develop, right now, i find it still suspect.
Zeev
Market Data 
Markets 
AI
