Lots of baby-boomers with money in the market. They are used to good living. As they retire, they’ll be pulling money out. Who’s going to take their place?
Many parents of baby-boomers lived their retirement on a combination of SS and interest from CD's, back when CD's paid 5-8% or higher. When their is an indication that interest rates will be going higher, IMHO, there will be a huge stock sell-off by boomers.
Limited-lifespan + uncertain stock market + higher interest rates = SELL!