The Dow Jones industrial average is poised to hit a record high of 25,000 points this week, with the Nasdaq and S&P 500 indexes similarly reaching new heights. The indexes are widely used as a kind of shorthand for American economic health, appearing everywhere from nightly newscasts to President Donald Trump’s tweets.But for many, perhaps most, American households, those indexes measure an economy far removed from their own daily bread-and-butter concerns.