Baby boomer mass retirement. This will increase the selling of shares across the board, since boomers will need to liquidate their assets to finance their living expenses when they are no longer taking salaries.
Sounds plausible, any idea what proportion of the large index funds they are thought to own? In the same vein, I wonder if pension funds can pose a risk or if they are self perpetuating enough to not cause any fire sales.
Baby Boomers have been retiring for quite some time already. The Baby Boom was from 1946 to 1964[1], so the oldest Boomers are now 77 (well past the usual retirement age) and the ones in the middle are around 68 (many have retired already).