"Job destruction caused by technology" kind of begs the question, especially when the US has an immigration policy that results in vast additions to the labor supply that compete with natives.
Shhhh! There is a massive labor shortage dont you know?
Are you suggesting that US is importing a vast army of truckers from Asia ?
Summers is talking about hypothetical future job losses in, eg, trucking. I am talking about present unemployment caused by excess labor in sectors like agriculture, food processing, food service, nursing, construction, etc.