
What do we know about dramatic meltdowns in the US stock market? In our recent memory, we’ve had three. In two of them, 1999-2000 and in 2007-2008, the writing was on the wall well before the fall. In the first, start-up companies with no earnings had colossal stock market valuations. In the second, tiered mortgage-backed securities for homeowners making no down payments were being sold to the general public. The third, in 2020, was in response to the global economy shutting down abruptly in response to the worldwide Covid-19 outbreak.