Even professionals who say the Dow Jones industrial average isn't the best gauge of the overall market still are marveling at its latest milestone.
They point to its close over the 20,000 mark Wednesday as a move through a psychological barrier that could improve confidence in the market.
Craig Johnson, senior technical research analyst for Piper Jaffray, has charted the significant milestones reached by the Dow going back to when the average crossed 1,000 in 1972.
"Nobody asks you 'how did the S&P do today?' " Johnson said. The milestone is "a gauge for sentiment more than anything else."
To Johnson, though, these milestone numbers serve as convenient measuring marks of progress.
And Piper Jaffray has found that when the Dow breaks through a 1,000-point marker, 52 weeks later the market is higher — with the S&P 500 index up 78 percent of the time with an 11.52 percent return and the Dow higher 72 percent of the time with a 9.6 percent return.
"I would suspect that we will continue to push ahead over the next year," Johnson said.
The Dow is the world's most closely watched market index, though it tracks only a basket of 30 blue chip stocks. The Standard & Poor's 500 index looks at a bigger universe and therefore provides a broader view of market conditions.