Actually, let me correct myself - if you look at alpha in Fig 3 (the intercept at 0 poverty, or the very wealthiest) the death rate continues to drop in absolut

Actually, let me correct myself - if you look at alpha in Fig 3 (the intercept at 0 poverty, or the very wealthiest) the death rate continues to drop in absolute terms for everyone - the death rate is only increasing in absolute terms among white Americans in the higher poverty index range (so the slope or beta is increasing with poverty as time goes on.) So poverty.