Factor by which women’s Tinder messages are longer than men’s : 10
Chances that an African-American mother is the breadwinner of her family : 4 in 5
Percentage change since 2011 in advertising spending on TV shows with majority-black audiences : +255
Percentage of U.S. readers who recognize native advertising as advertising : 15
Amount that Carrier promised to invest in an Indiana plant in a deal with Donald Trump to save domestic jobs : $16,000,000
Percentage of that money that will be used for automation : 100
Ratio of the revenue of Detroit’s three largest carmakers in 1990 to that of Apple, Google, and Facebook in 2014 : 1:1
Of the number of people they employed : 9:1
Average monthly rent for a workstation at a New York City co-working space : $1,110
Number of treasure hunters who have died searching for the buried riches of a New Mexico art dealer : 2
Factor by which a poor family in California is more likely to receive welfare than a comparable family in Louisiana : 18
Factor by which the poverty rate has grown faster in U.S. suburbs than in cities since 1990 : 2
Percentage of the U.S. population that lives within ten miles of a Walmart : 90
Amount taxpayers spent in 2013 on food stamps, Medicaid, and housing assistance for Walmart employees : $6,200,000,000
Estimated portion of total food stamps that are spent at Walmart : 1/5
Number of U.S. states that forbid municipalities from banning plastic bags : 9
Factor by which carbon emissions from Norway’s oil exports exceed its domestic emissions : 10
Number of flights departing Phoenix in June that were delayed because it was too hot for planes to take off : 60
Respective ranks of Iran and Iraq among countries whose citizens experience the most anger : 1,2
Of Greece and Iran among countries whose citizens experience the most stress : 1,2
Percentage of Iranian college students who are women : 46
Of Iranian workers : 17
Estimated number of U.S. visa applicants who will be asked for social-media data each year under a new policy : 65,000
Average number of years refugees live in the United States before having paid more in taxes than they’ve received in benefits : 16
Percentage of American adults who say they would run for Congress if they thought they had a chance at winning : 37
Percentage of likely U.S. voters who think that the expense makes it impossible for most people to run for Congress : 71
Number of states that do not have inheritance or estate taxes : 32
Portion of likely U.S. voters who think most members of Congress would sell votes for campaign contributions or cash : 3/5
Who think it’s very likely their own member of Congress has done so : 3/10
Estimated number of additional congressional seats Republicans won last year because of gerrymandering : 22
Number of consecutive days after Donald Trump’s inauguration on which he made an untruthful comment in public : 40
Portion of ex-lobbyists in the Trump Administration who lobbied the agency they now work for within the past two years : 1/4
Portion of Trump properties sold since May 2016 that have been sold to anonymous buyers : 7/10
Amount the Pentagon has spent on forest-pattern uniforms for the Afghan National Army : $94,000,000
Percentage of Afghanistan that is covered in forest : 2
Rank of Georgia among U.S. states and Washington, D.C., in the likelihood that a young person will enlist in the military : 1
Of Washington, D.C. : 51
Rank of first aid among the most popular Boy Scout merit badges : 1
Of bugling among the least popular : 1

Figures cited are the latest available as of July 2017.
“Harper’s Index” is a registered trademark.

September Index Sources

1 Gareth Tyson, Queen Mary University of London
2 National Domestic Workers Alliance (Washington)
3 Nielsen (N.Y.C.)
4 Bart Wojdynski, University of Georgia (Athens)
5,6 Teneo Strategy (N.Y.C.)
7,8 McKinsey Global Institute (San Francisco)
9 Instant Group (N.Y.C.)
10 New Mexico State Police (Santa Fe)
11 Center on Budget and Policy Priorities (Washington)
12 Scott Allard, University of Washington (Seattle)
13 Walmart (San Bruno, Calif.)
14,15 Americans for Tax Fairness (Washington)
16 National Conference of State Legislatures (Denver)
17 Stockholm Environment Institute (Seattle)
18 Phoenix Aviation Department
19,20 Gallup (Washington)
21,22 Human Rights Watch (Washington)
23 U.S. Department of State
24 William N. Evans, University of Notre Dame (Indiana)
25,26 Rasmussen Reports (Asbury Park, N.J.)
27 Office of Joel Michael, Minnesota House of Representatives (Minneapolis)
28,29 Rasmussen Reports
30 Associated Press (Jefferson City, Mo.)
31 New York Times (N.Y.C.)
32 Public Citizen (Washington)
33 USA Today (Denver)
34,35 Office of the Special Inspector General for Afghanistan Reconstruction (Arlington, Va.)
36,37 David Trilling, Harvard University (Cambridge, Mass.)
38,39 Boy Scouts of America (Irving, Tex.).